I think you have to distinguish social media and anonymous social media. I find platforms like Facebook fine, where people have to own their comments they are far more likely to be diplomatic. Where people think they are anonymous, you get far more racism, homophobia, transphobia, objectification of women, xenophobia, sectarianism etc
Here's a good example from the football world. And a bad decision...
https://www.irishexaminer.com/news/cour ... 19691.html