Same as anything else. Go talk to people who you consider fascist, understand their point of view and concerns, and then make arguments to them in terms of those concerns.
Frankly, I don’t think that it’s likely an incredibly-entertaining task.
I also think that the term “fascist” has a pretty extensive history of being overused, though I suppose from the standpoint of this, doesn’t really matter much.
https://old.reddit.com/r/scuba/comments/nionzq/do_you_ever_just_listen_to_the_sound_of_the_reef/