I think it's fine to unfriend right wingers who support fascism and misogyny and bigotry.

But the main reason is, I think, because your time is too valuable to waste on them. You'd be better off spending that time reading, petting a dog, or strategizing with good people who, like you, want to right the wrongs in the world.

Also, I believe that arguing with right wing insanity helps those terrible and cruel views retain undservered credibility. I suggest you drive by those view quickly to avoid the stench.