My first name is hyphenated - imagine something like Mary-Anne but different names!
The amount of people who call me just 'Mary' when I have introduced myself with my actual name is frustrating, and, really strangely, I've been referred to so many times as 'Anne' - if I were to shorten my name to anything, it wouldn't be the second part of my name!
I can understand people struggling with difficult or foreign names that might not be clear how they're pronounced (my surname for example, I will never take offence to someone being unable to pronounce it!), but AIBU to think it's actually just rude to not call someone by the name they've introduced themselves as?
I don't think I am easily annoyed by things but this just seems like something that inexplicably annoys me.