Fire their ass and give the innocent customer free food for life.
Hold out for the "plus."
"'I'll take it!'?? Who told you to take it? I didn't tell you to take it! I wanted to see what came after the 'plus'! Steak isn't hard to get. I can get my own steak!"
Actually, steak for life wouldn’t be half bad....
The restaurant needs to be put out of business, period.
Free food hell. A good attorney would get him a million and wake up some of these dilberts.
Would you really want to eat food from the restaurant who labeled you a racist? I'd be afraid some other doofus they hired would do something to it. I'd tell them they can talk to my lawyer.