[Klinky]

My problem is that if you did this in any other sort of setting, there would be lawsuits about discrimination.

Really? Penny Arcade is kicking him out for being an asshat, not because he's black, gay or Muslim. Don't businesses have the right to refuse service? If Penny Arcade is breaking a contract then a suit over breach of contract is fine, but I doubt that occurred & Penny Arcade can revoke vendors from PAX as they please per contract/TOS.

As far as your Facebook example, if an employer was to contact a person who looked drunk on their Facebook & said "This doesn't seem to be a very professional image you're putting out for yourself." and the person replied back saying "Fuck you asshole cunt faces, suck my balls". I think the business has every right to not hire that person.