Yep, in general we don't allow personal attacks. However, there are some exceptions -- people in the restaurant or food industry do participate on the boards, but it's fair game to criticize their food or service etc. if that's one's opinion/experience. e.g. saying "X is a horrible chef" is allowed.
If you (or anyone) has come across a personal attack, please use the "Report" button at the bottom of the post and we'll have a look.