[Edited by king-of-games, 7/28/2010 5:17:22 AM]
I'm not sure about bashing. I think it's just another word for flaming but don't quote me on that.
It's almost universally not allowed and if frequent becomes a bannable offense.
Bashing: Similar to flaming, but usually meant to degrade or belittle a person OR group of persons.
For example, going on an anti-gay tirade here would be bashing, not flaming, despite the existence of gay, bisexual, and other sexual minorities on this site.
Bashing is quite commonly an easily justifiable ban, due to the sensitive nature of the group aspect and the common groups bashing is aimed at.
Long story short, so long as you don't act like a jackass and insult people here, your account is safe =3
Bashing on the other hand is more like attacking someone for their opinion.