I don’t think he has bought into an untruth. There has been a lot of vitriol going around on Facebook, which is what he is referring to based on a following conversation we had, involving labeling and name calling on both sides.
I think we’d all be better off if we adressed our differences related to positions rather than as personal attacks. For example saying, “How can you support x when it means y will happen?” Or “That statement is not OK with me. I find it offensive because …”, rather than “If you support/say that you are a …”