Those people who get riled by insults on social media have fragile egos. And then they engage in some kind of rant as a response. And if they “win” the angry exchange, what exactly have they won?
It’s an exhibition of pointless anger when anger is a very corrosive emotion for the person experiencing it. So why play such a self-destructive game?
Best way to deal with insults on social media is not to respond to the bating, but do reflect on the substance of the criticism to see if there is any real merit to it, so that one might improve oneself if there is any merit by altering one’s ways. Otherwise, let it go — just words on a screen from someone anonymous who doesn’t have a clue about you, doesn’t know you at all, and will never meet you.