[Trasion]

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Your members are posting hateful messages. And you reserve the right to remove, edit, move or close any thread. Unless your agreement is different. You're the administrator, don't let your members run your site for you while you sit there, scared to be sued from someone who can't do anything. If you're that scared, then delete the messages.

He can't sue you over what your members wrote on your forum, unless it violates the law, which it doesn't seem to from what you've said.

You can either delete the bad messages, or ban that member who's sticking up for his company. Either way, you'll be doing nothing wrong, you'll be moderating your own forum, which is what you are supposed to do.