I admittedly didn’t read the article (no time as I speak), but surely they included a control group?

It’s a lot easier and much more productive when you learn to talk to other people in a mature, healthy way, and insulting someone, slurs or not, never is. Try leaving school yard talk, like personal attacks, where it belongs, and see how much less stressful it is when you’re not fighting people all the time, and how much more people will listen to you.