Humans have this tendency, especially in this election year, for some reason, to avoid any degree of introspection and dig in their heels after making some ridiculous statement, observation or underhanded insult. Doesn’t matter if it’s racist, sexist, homophobic or just plain adds insult to injury.
The initial slight can be amended, atoned for, etc. It’s the doubling down that’s the issue. Doubling down means you’ve already decided you’re right and screw everyone else. That’s a barrier to actually having a dialog that gets things fixed.