I have nothing against role-players nor do I find the practice in itself to be weird, given that it's my favorite part of playing D&D, I just don't mix RP and MMOs. Nothing wrong with those who do, though, they're having a good time and it's all that matters!

Where I draw the line, however, is 'imposing' said role-play on others, especially in a party environment. If you want to Role-Play, do so on your own time, not mine. I'm here to pew pew some monsters and explode some bosses, not entertain the musings of Sir Reginald the Third. And this goes for non-RP chatter as well: nothing wrong with a lil' socializing when running to the next pull or while waiting for someone to catch up, but when a healer stops halfway through a pull to chat away while the tank is fighting for his life due to not getting heals, I tend to get annoyed o.x. It also drives me bonkers when we get to a boss and everyone stands there, doing nothing, while the tank presumably chats away with their FC.