If you are in public...?

Probably not, but for good reason. When I go places, I am almost always with my children. If I responded to his ignorant comments and got into an argument with him, what good will it accomplish? None because he's not going to end up saying "You know, you're right, ity is fine." So I don't want to set a bad example for my children by getting into a screaming match in a public place.