I'm going to make two lists for you, even though I know I'm preaching to the choir.
Here are some things that can be fairly compared to the acts of Nazis:
Mass murder (I'm aware that those overlap, but they are not strictly the same thing)
Violent Racism (ditto the parenthetical above)
Leaders who encourage/support/instigate the things above
Propaganda that encourages/supports/instigates the things above
Ghettos in the original sense of the word.
A few other things, but you get the idea.
And here is what cannot be fairly compared to the acts of Nazis:
Almost everything else.
The point is, if you're trying to make an argument about a policy or a person you don't agree with, and they're not committing one of the acts in the first list, and the best thing you can come up with is to label them a “Nazi,” just shut up, because you've already lost.
Peace and love,