I agree with the OP, I never understood why people take themselves so seriously in pvp. It's just supposed to be about having some fun for EVERYONE, not about being a douche.
Anyway, I try to not let it bother me. Remember, a troll is only good if it gets a reaction out of you.
Slightly off-topic, I once LOS'd a sniper and he used the /laugh emote on me, 3 globals later, my teamates obliterated him. I wonder if he thought that was funny, too?