Further Clarification (just in case people don't understand):
Ass, along with other words (use your discretion) is acceptable under circumstances where it isn't used in an overly insultive way. saying "man, don't be an ass", is acceptable, due to the playful nature of the phrase, but saying "SUCK ON MY ASS YOU N00B LOL" is, as you might have guessed, kinda not allowed :icon_wink:
it's usually the way in which a word is used that makes it unacceptable, rather than the word itself. Profanities (you know what I mean) are the exceptions to this case, and should be avoided in all situations.
besides, I personally believe that it's more fun to use inventive insults like Shag-haired Villain, they're in many ways much more satisfying!