How is asking people to avoid talking about something literally fascism?

They aren't pointing a gun to anyone's head telling them not to.

Freedom of speech isn't "everyone has to be okay with you saying whatever you want whenever you want"; it's "you can say what you want when you want, but they don't have to like or agree with it, and they can voice their opposition. Also, some things shouldn't be said at certain times; they can be, but shouldn't".