The only thing I can think to do is call them on it. But the problem is that they are not engaged in dialog, but monologue. If you don't agree with them, the conversation ends. It’s the only way they can justify their bullying and inhumanity. Very like the beginning of hitler and co.
I think the only really effective thing we can do is to vote with our wallets, Don't go to their hotels, restaurants, etc. and tell them so. Also laugh at them when appropriate. Mel Brooks and others have pointed out how effective that can be...
But they're scared and greedy, both powerful motivators.