Social media ensures the cowards of the keyboard behave badly . Were they to speak to people in the office or street in the same way they would get a right handed. Ignore them! Playground bullies hate it.
It's a similar feeling to the insulation and isolation people feel in their cars, which leads to incidents of road rage which would not occur if both protagonists were pedestrians.
The isolation and insulation of social media does play up to the nasty sides of some people - but, as with society as a whole, they remain a minority which we must always endeavour to work around.
There are some cowards who hide behind their keyboards, safe in distance and anonymity. Those very same cowards always play the victim when the tables are turned.
To return to the original post - I've met quite a few ABers in 'fleshworld' (as opposed to 'cyberspace') over the years.
There were absolutely none who were more difficult in real life than on AB - most were pretty much the same in both places - but one or two (no names no packdrill) were significantly less abrasive over a pint than over a keyboard.
However, that's just my personal opinion - anecdotal, unrepresentative and entirely subjective - which is pretty much CB defined.
I must confess to not knowing what the term 'social media' means, and would welcome a definition. If it means communicating over the internet then AB is as much social media than anything else.