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?
Just one person, with whom I work, decided to call me Maggie and several others tried calling me Peggy. Both are derivatives of my actual name (which they knew). How would you ask them to use your actual name? I use all their names correctly and always will do that unless or until they ask me to call them anything different. I see no point in their asking me what my name is if they then intend to shorten it. I would never use the shortened version of a person's name unless they asked me to do that.
You would say with a smile “please call me Margaret, I don’t like the short forms” and repeat as often as needed. It is not really bad manners, it’s nothing to get defensive about.
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