Sometimes you just have to tell people to go to Hell.
Actually, we should practice this until it is easy and natural. If you give an inch to these people, you are in for a yard. My neighbor wants me to fly a USA flag. I fly "The Spirit" flag ( red with with a palmetto palm and crescent...actually the first Confederate flag). This woman has a life size cardboard cutout of Obama in her front room). She told me flying my flag should be illegal...I just smiled and said, "I think busybody neighbors like you should be illegal." End of discussion. She once said "nobody should have a gun" I responded with "Everybody should be required to have a gun." End of discussion. We have to come back at these people with the same stupid logic...discussion is a waste if time with them.