No, actually, we just treat the people willing to enthusiastically back Trump as complete retards. Because those people are either intellectually or morally bankrupt, and we prefer to assume people are stupid rather than evil.
And let’s be clear here, the stupidity is not bipartisan. When one side of the political spectrum rejects global warming unanimously and the other side does not, one of those sides is wrong. And it so happens to be the one you’re on. One side has clear, reasonable, supportable policy proposals. The other does not. You’re on the latter side. So you’ll have to excuse me if many of the proposals on what to do about people who are either stupid or evil or both sound just a little bit condescending. It’s because they are. This isn’t a case where discourse is needed. This is a case where education is needed. A Trump supporter complaining about condescension is like a Young Earth Creationist complaining about condescension. The only question is, why would you self-identify into that group?