Legal Question in Civil Litigation in United States

Those are perfectly valid reasons to refuse service. Most businesses would tell a customer like that to leave and never return. But the fact that your company can refuse to serve him doesn't necessarily mean the decision is yours to make. It's up to your superiors whether you have the authority to refuse service or whether you must ask your boss. They could fire you for doing this if you're not authorized to make such decisions on your own, if it defies instructions from one of your superiors, or if it violates company policy. None of these things seem likely, but they're worth mentioning.