How do u deal with a obnoxious, non-intellectual & "conservative-Christian" retired father-in-law?

He makes comments about my own dad, whom he calls "smooth" because he is very polite & diplomatic, unlike himself who is like a bull in a china shop, always calling my neighbors "a**holes" because they parked too close when he comes over or something. He constantly spews uneducated comments such as, "I wish no one spoke anything but english in public because they might be saying something about me." I have been married to his daughter for nearly 9 years, but he has always been insincere, brutish, vaguely rude, aloof, unfriendly, and makes comments that appear as though he is jealous of my dad who is quite educated although is quite up in years now.