There’s lots of polemic comments on the other post as well, but I did like this thing someone there said, about how the greatest impact can be made in real life, where the bigot in question, has a real person in front of him, making it much harder to dehumanise them.
Online, there probably isn’t much to be done to change someone’s mind.
When in person, if he is still an asshole, treat him like the asshole that he is.