When someone doesn't agree with your opinion anymore and just shuts you down and, basically, tells you to go fuck yourself for being an individual. It usually makes you spend the weekend feeling bad about yourself.
Casey didn't want to hear anymore about my thoughts on his favorite football team so he said "On a serious note, I'm out having fun and having a good time, you're really not being cool and pissing me off just leave me alone while they play." and, upon trying to express your opinion of a tv show says "oh, shut UP, I can't deal with this" and then you feel bad inside for having tried to be a part of his life. It was all extraordinarily dismissive.
Someone who exhausts you with their constant need for affection to glorify their massive egos. You don't want to be their friend anymore but you're afraid they'll take out an ad in the newspaper denouncing you as someone uncaring just because you abhor interacting with them any longer.
Casey is truly a prima donna, but intelligent enough to contact the editors of the WSJ, so I'll continue to suffer his presence.
A coworker who goes around calling other "prima donna" while secretly hoarding a Cracker Barrel factory's worth of cheddar cheese in his desk, which is impressive since his desk is the size of a cassette tape.
Kyle is a real cheddars but, ever worse, he smells like gouda.