I think some of the confusion here might be that this comic is specifically referencing booting out bigots and their apologists.

if someone is willing to argue in bad faith (in this case, specifically bigots), there is no reason to listen to that or anything else they have to say since they’ve shown they are willing to argue in bad faith at all. I also think anyone who is an apologist of them is also not worth listening to because they are in bad faith by proxy.

that being said, it’s perfectly okay to have people arguing in good faith while coming to different conclusions. there can be disagreement and that is healthy as you’ve said.