I'm not all the good at insults. Sure, I talk a good game (Get it? Insults are spoken! Get it?!), but I always seize up when insulted in person. I'm just not that quick. Five minutes later, I have a good comeback.
Enter the internet. Every conversation is on threads. All comments are a few minutes apart. I'm suddenly 15% smarter than in person (and 30% sexier).
I'm also far more polite on the internet. Insulting someone from the anonymity of the internet is like what we gamers call Spawn Camping; you can hurt a large number of people without any consequences to yourself.
I never spawn camp. Also, I never play multiplayer shooters.
I'm also polite because I'm waiting to use a comeback in response to an insult. It's the online equivalent of a daisy-cutter bomb:
Insulting a stranger from the safety of the internet is the act of a coward.
I don't know why you choose to act this way, perhaps it's the abuse heaped on you by the men who pay you for sexual favors. Perhaps it's a genetic defect surfacing after generations of inbreeding.
Whatever the reason, I have no interest in talking to you anymore.
I don't know why this works so well. Whatever the case, most of my attackers go silent, block me, or (at the very least) sputter for a few hours and then come back with something incoherent about being insulted by someone they insulted.
Feel free to use it yourself. It's highly gratifying.