Roleplaying, per se, is fine. I absolutly have no problema with roleplayers at all. Actually, most of them, I've noticed, are kind lovely people who love the world they are playing in. Not to mention they usually have the best glamours in this game :P . Unless those RP'ers are forcing others to join it, or ruining other people's enjoyment of the game, I don't see the problema of it. There are RP servers and it is a MMORPG.
ERP, on the hand... I don't understand it. And the ERP'ers are usually the ones who force others to be part of their circle jerk in such a rude way. Maybe the ERP'ers I've found were a vocal minority, but I don't understand it still ahah.