You're preaching to the choir here. But I'm an Admin on a social media website, not their parent, spouse or employer.
Two points here - some people believe "that's the silliest thing I've ever read" is a personal attack. Others think calling someone an "asshole" is simply a mild insult. There are a lot of generations, different cultures and people from different walks of lives on this site. They tend to feel differently about what constitutes a "personal attack".
Second point - there's not a lot of civility or decorum these days in any public space.