The scariest thing about Nazis is that they're human and even pretty smart sometimes. To reiterate what others are saying: dehumanization leaves you in a blind spot for the humans around you who can silently undergo vast transformations from people you thought you loved into Nazis. They throw away their humanity yes, but they had to be human to throw it away. Dehumanization is also how the process of becoming a Nazi starts. Don't even mirror it in jest, try on radical empathy and face the truth: humans are horrifically complex. Nazis are unfortunately humans.
Nazis are incredibly mechanical honestly. They lose empathy and then others become mearly disposable objects. You might commit murder just like you would throw away a plastic bag. There is a totally absence of care which leads you to inflict terrible things to others.
I also doubt how many actual Nazis there are. It is often thrown around which leads it to lose the horrible meaning. I've seen people shout Nazis over much less deadly things. Don't confuse systematic mass murder with someone having a questionable character. They can be a terrible human but they haven't committed the level of crimes as mass murder of millions. The level of death and suffering caused by the holocaust is not a joke and certainty not something to use when your upset.
Sorry for the rant I just needed to get that off my chest. I'm not really addressing anyone in particular.
One of the biggest mind fuck novels I ever read was "The Iron Dream' by Norman Spinrad.
On one level it's a 'hero's journey' story about an exiled prince who returns to his homeland and defeats a bunch of evil mind controlling wizards. Lots of excitement and adventure and terrific battles.
The fucked up part is that it's the last novel Adolph Hitler wrote after migrating to America in 1921.
Hitler was a popular illustrator who eventually felt confident enough to start writing in English. He was a popular figure at conventions and had a huge fandom.
The Iron Dream is a metafictional 1972 alternate history novel by American author Norman Spinrad. The book has a nested narrative that tells a story within a story. On the surface, the novel presents a post-apocalyptic adventure tale entitled Lord of the Swastika, written by an alternate-history Adolf Hitler shortly before his death in 1953. In this timeline, Hitler emigrated from Germany to the United States in 1919 after the Great War, and used his modest artistic skills to become first a pulp science fiction illustrator and later a successful writer, telling lurid, purple-prosed, pro-fascism stories under a thin science fiction veneer. The nested narrative is followed by a faux scholarly analysis by a fictional literary critic, Homer Whipple, which is said to have been written in 1959.