Conservatives: Should it be legal for a restaurant to give lower quality food or service to a minority patron?

Unfortunately, it already is legal, due to laws that forbid restaurants from refusing to serve people that they do not want to serve. If that restaurant owner was aloud to discriminate and not serve, in your scenario, that black man who decided to dine in that restaurant he would have never had to endure that horrible dinner and wouldn't have lost his money for it. But if it was open knowledge that that restaurant owner discriminated against blacks he would more then likely loose clients.