I had an RP'er in a dungeon whose character was supposed to be afraid of lightning and everytime lightning was cast they would use the /panic emote and run around (they were the tank) making the run more painful and annoying.

Like, if you want to engage in that stuff, fine, power to you, but please only as a pre-formed party, RP is fine as long as you keep it to you and your buddies (or at least not obstruct a run)

As for ERP, keep it in your own group and don't let it leak out, engage in it if you enjoy it, but its not something most other players want to see.