Stunningly weak mentality. Not surprised to see it on display here, HN is polluted with broken dorks.
If you don't fight back you will be the victim of further abuse. If there's no countervailing force against sadistic psychopaths, they will continue their destructive behavior.
You should absolutely beat the shit out of bullies. To idly stand by out of some misguided slave morality, you permit their evil, and allow the world to become worse.