Eee, so long as they're not breaking any FH rules, I think it's best not to return the aggression they're showing. After all, if you sit there and go at them and tell them 'what bad roleplayers they are', I highly doubt that would cause them to straighten up.
Squee, as I said before; No need to let yourself get angsty over it. Just end their little game by leaving the situation. Brush it off, and have a chuckle about it. c:>