I think some rather small people have a need to demonize those they disagree with, and often call them the vilest names they can think of.

Imagine you're talking with someone about a person who doesn't like electric guitars used to play folk songs. Imagine you call that person a "folk nazi" and the person you're talking to informs you their parents died at Auschwitz at the hands of the real nazis. They ask you to explain how someone who has done nothing worse than dislike electric guitars can compare to a group of people who slaughtered millions of men, women and children. What do you say?