I can’t speak for Terry Szuplat, but I would think the same rules apply.
How exactly would calling an anti-abortion extremist a subhuman nazi terrorist help anything at all? It might make them feel more strongly in their beliefs. It might make you look bad, and get more votes for anti-abortion extremist positions. It might normalize the language of dehumanization, furthering aims of authoritarians. MAGA lives on victimhood, making it stronger hardly helps. Listening and being reasonable may be hard, but is more likely to be heard.
Regarding tolerance of the intolerant - I see no incompatibility. Vote to ensure their views don’t win. Outlaw violence. There’s times where civil disobedience is called for. Terry isn’t suggesting just give up and let others run things out of fear of offending someone.
If I may offend you now by including Star Wars as a Disney movie, Luke doesn’t win by killing his father and becoming emperor. That was Vader’s thing. Vader is evil. So is Trump. But I wouldn’t go airing commercials talking about how evil Trump and his vermin followers are unless I was aiming to get Trump elected.
Start local. Where I live we have ranked choice voting for mayor.