Suggest to your husband that he never argue with a fool, lest some bystander think they are are both fools. I've learned that, unless you think you can change their minds, which is unlikely, because liberals have a different world view and values, or you can influence an audience, arguing with a liberals is a waste of energy and leaves one feeling angry and needing a bath.
You know that is very true...I usually just tell them that in my opinion they are wrong and that I will probably not change their opinion and they surely will never change mine. And leave it at that, with a strong smile I might add.