I hate when I miss part of what someone said and when I ask them to repeat it, they start from the very beginning and very slowly repeat what they said like I'm a total moron. (Sadly, it's my husband who does this.) I usually only missed the last part, but he explains it all from the start. :P
I hate when people assume that if they like something or consider it "normal" then I will like and agree with it also. And if I don't, I'm weird or have a mental problem.
I hate when I'm trying to read the newspaper in the morning and someone won't stop talking. I hate to complain about this - I'm glad somebody wants to talk to me. But let me finish reading first!