What I'm gathering from HiTech/general AH policy...
Bypassing is fair game for reporting, but it's up to your peers in the arena/BBS to decide what passes for abuse and what doesn't and actually DO the reporting. And after that, it's up to HTC to decide whether you deserve a mute.
So if you get muted, not only do you have to piss somebody off in the arena, but you have to be abusive enough for HTC to decide your behavior warrants a mute.
Personally, I think that sounds fair. Under this system, if you get muted, you pretty much deserve it.