Do most cosplayers consider it rude to greet them or speak to them jokingly, as if they were the character?
I don't usually go to conventions very often, but on the few occasions I have gone, if I see a cosplayer who's done a truly amazing job, when I go up to say hello and congratulate them on their work, I tend to crack little jokes as if I were actually the character they're portraying (Both men and women find it amusing)
And while sometimes they take it in stride, others get angry or act unfriendly toward me.
Does this kind of attitude usually bother you?