It's like they're trying to make me mad

Restaurant owner only speaks English. Hangs sign up telling people this. Finds himself the target of legal action accusing him of discrimination based on national origin or ancestry. Gah. There are a few problems here. One, what does requiring patrons to speak English when ordering have to do with discrimination? Two, whatever happened to free association? Yes, he could have made the sign read a little more PC, but he is completely within his rights here. If you as an owner of a private business can't deny service on the basis of not being able to understand someone, I don't know what's next.