@woozle You. Your language is the offense. You're the one who is making a judgement of what that other person is. Stay cool if you want to have a reasonable argument.
@starfall Agreed but acting like a Nazi is not a solution. Education about what the implications are is a better way. One of the most profound shocks I had was visiting the information centre on the site of the former Gestapo headquarters in Berlin that specialises in documenting the horrors of Nazism. Thousands of German teenagers are taken on tours there every year to understand where it leads. https://en.wikipedia.org/wiki/Topography_of_Terror