Is it bad manners to shorten a person's name when you have introduced yourself to that person using the correct pronunciation of your name?

Luck=Moloch=demon.Gov't is killing you with highfrequencyelectricity. Theotokos Virgin Mary gave prayers to "Schema-nun Antonia" on how to save aborted babies from hell. If you pray these prayers diligently, aborted babies are released from hell. On each painted nail there are forty demons. Smoking is censer to the devil.Using foul language calls upon Pagan deities (aka demons); Holy Spirit departs on seven meters. People who use drugs see demons who cleverly disguise themselves as ghosts and aliens.America will be last country to switch to Euro (antichrist's world currency). Contraceptives = abortion;using contraceptives for one year = five aborted kids.Miscarriages happen because of high heels; cesarean because of pants (second generation cesarean will be infertile).Unbaptized aborted/miscarried/unborn babies burn in hell until Final Judgement; if pregnant, keep the kid and deliver at home because kids are chippedusing IVs and vaccines in hospitals. 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It doesn't just have to be during this procedure (could be anything you sign up for or anywhere where there is a secret scanner); biometrics (fingerprints, eyescan) or getting picture for passport are very dangerous because they could mark you secretly. GabrielUrgebadze said thattheydoitonindexfingerwhenthey scan your finger. Basically, trytoavoidnewdocuments at all cost. Policewill microchip and isotope ray people on highways. Chipped people will be influenced by computers to take grey plastic card; but when they do, greenmark by isotope rays is given on forehead/wrist. Food stores will isotoperaypeopletoo. Antichrist will also release prisoners/insaneasylumpeople tomarkpeople. Reject 666 at all cost because it leads to permanent hell. If you're about to be marked, pray the Jesus prayer. Hide with OrthodoxChristians to escape 666; leave all electronics behind so that antichrist's minions can'ttrack you; burn documents because they're fromSatan. TheMostHolyTrinity gives you a name during baptism; devil gives an antiname during antibaptism (ex. SocialSecurityNumber). People who die with these Satanicdocuments go to concentrationcamp in hell to await FinalJudgement; once the BEASTComputer is burned down, souls will be released for FinalJudgement. That's why you should give back documents of your deceasedrelatives back to the gov't so that the gov't cancels these digital antichristiannames given during antibaptism by the beastsystem; or just burn thesedocumentsbecause gov't could get upset and could send demons to mark you because of this outright act of defiance. Prophecy from halfamillennium ago describes FinalJudgement like this: Jesus was very upset with people who had littleboards (plasticcards) in their hands because they wanted discount from the antichrist. 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Priests who participate in ecumenism/COVIDrestrictions will have Pagans walking on theirheads in hell. ArkhimandriteAntoninKapustin left a prophecy that Church of All Russian Saints in Gorny Monastery, EinKarem, Israel will be blessed by forerunner of antichrist; pseudoPatriarchKirillofRussia and MarkofBerlin blessed thischurchin2007. Whenpriestspray forcurrent gov't (insteadofprayingfor futureTsar),Jesus getsupfrom Histhroneand turns Hisback tothem. DryLindens leaves(bathbroom)toeatduringfamine.

Yes it is bad manners. I have encountered it several times.

If i wanted to be called by just the first syllable of my Christian name then that is how I would introduce myself.

Once you become well known to each other it is ok to use a pet name or shorten form .ex .Meg for Margaret. If you have just introduce yourself to someone and if the other party call you by a shorten version it is not correct .It is bad manners .

People do think that it's friendlier to call someone by a nickname. "Margaret" is awfully formal, and they may feel like they're distancing you when they say that. But you can certainly say that you would prefer to be called by your full name. I always wished there was a nickname for my name, but I understand that you don't feel that way. They are certainly not trying to be rude. 

I consider this to be bad manners.  People try this with me all the time.  I keep a hardline and correct them with a sweet voice and a smile every single time.  Treat them like you feel sorry for them for having made such a dreadful blunder.  If they have any shame they should be embarrassed.

It's not always malicious, some people were just brought up this way.  If they keep doing it on purpose after being asked not to, and you do have to tell them because people aren't psychic, then it can be construed as bullying.  I would make an exception for someone with a speech impediment and let them find their best version of my name.

To me it depends on who does it. I don't appreciate it if I'm talking to someone in an official or formal capacity and they start shortening my name. On the other hand, my American friends have all just done it straight off the bat, and it's come across as a sign of affection, so yeah, I'm okay with that, even though it was strange the first time someone did it, probably because I was in my mid 20's the first time it happened (a guy I was seeing at the time). Up until then, not even my own family had been shortening it, albeit they do use a completely different nickname for me.

If you don't like it, I would suggest that you correct them immediately, but be friendly and smiling when you say it e.g. "It's sweet that you call me Peggy, but I prefer Penelope".

My sister had a boyfriend that my grandma and aunt would use a shirtened version of his name.  I could tell it made him feel uncomfortable but it’s not a big deal.  A few girls at work call me a shorter version of my name but it’s because we’re friends, not strangers

They are merely trying to be informal, like they have known you forever. Like you are a buddy. Bad manners, yes. 

Being assigned a nickname is an indication of acceptance. 

Welcome to the team.

Unless you're one of them easily offended,  thin skinned people who always have their radar on high gain to detect anything that can be construed as offensive.

Terms of endearment. Not terms of engagement. 

speak up and tell them your name and to use it from now on! not Maggie, not Peggy, not anything else not your name. My name is _____,  got it!