Good idea, but not sure it would have much effect. Usually, the profanity comes out after a couple barbs have gone back and forth, and by the time that happens, a full scale flame war is in progress.
A few times I’ve been shocked and horrified by the outright cruelty and taunting that happens. Not much, but it’s there. And as a few posters have pointed out, it’s usually the same idjits.
So going along with your point I would make a plea for plain old civility. In all my life, I know the people I respect the most are those who have a good modicum of self control.
Some people it seems just have to be right. Keyboard Commandos, I suppose.
I’ve never heard Ronald Reagan swear.