I'm well aware of dumb shit that I've done in my life and I try to learn from it and improve.

The difference I suppose is that I don't think that words I use are dumb shit.

Someone wants to be the moral authoritarian over the language you use? Only if you let them. And why would you do that?

Dumb shit as defined by whom, though? People one doesn't agree with? Why should one stop doing it, then?