I wish I had the definitive answer but in my books that line has been crossed in this context.
I don’t think it’s as gray as we might want to pretend it is right now. The state of discourse online seems like some level of indicator something has happened recently that is descending us into chaos. Personally I do blame Trump and RPG.net seems to share a similar sentiment.
The state of discourse online is such because of the Culture War, and the Culture War predates Trump, and possibly caused Trump to be elected in the first place. The current phase of the Culture War began with universities getting creative with their definitions of "bigotry", "white supremacy", "racism", and "sexism". The worldview promulgated there eventually percolated to the mainstream and is a massive driver of the ongoing cultural conflict.
Thanks. Trump is certainly a symptom of something that existed before he took the stage. I don't think that absolves him but the problem isn't going to go away just be putting him out of sight and out of mind.
(p.s. the Thanks is generally for your response. Just want to be appreciative for peoples thoughts while discussing this topic)