Also can anyone remember exactly when this shit started? When did he start doubling down over and over on this utterly degenerate and wrong shit? Did this spiral out of control from his gunt guarding and simping for Ralph's grooming behavior, which looks like almost normal behavior compared to what followed.
I think it has always been there but because Dick has always had an antagonist to focus his energy and attention on he has been able to hide it and we as viewers hasn't noticed the little tells because people like Maddox and Chris the Kiwi's autism shone so bright it hid Dicks degeneracy.
Without people like that for Dick to focuse on and in a way hide his flaws behind their spergery, his own flaws are much more obvious so it has been a slow decent after the lolsuit ended.
But when the lockdown happend things started to accellerate.
Especially because Dick is a massive extrovert and needs constant confirmation and attention from other people the lockdown was brutal from him.
and thats when the cracks really became obvious. Him sitting at home alone drinking and doing drugs showed that Dick was far from the Alpha Chad he claimed to be (CAN I FUCKING PROOVE THAT HE HAS EVAH CLAIMED TO BE A CHAD!!!!!!1!11!1!!!).
But more a washed up neverhasbeen from LA.
And then Jersh unknowingly shot him in the stomach.
Null just wanted to be honest and true to Dick and tell him why. But what he did was to reject Dick, and thats what broke him.
He has been rejected before but he has alway had a way to turn it around and spin the rejection as something hatefull done by the other guy and capitalize on that.
He couldn't do that with Null. Null said calmly and honestly to Dicks face why, and Null didn't even reject Dick. He made it clear that he really likes Dick.
He loves Dick 
But it was the people Dick had chosen to hang around with that he couldn't stand and wanted to get away from.
Dick had no way to spin that and he is either to emotionally immature or the drugs has rotted his brain away so much that he doesn't know how to handle it.
So he does what he does best and has a massive sperg attack and doubbles down on anything. But unlike before there isn't a antagonist he can attack and hide his flaws behind.
So now everyone sees Dick's flaws and what he really is like.
He has always been this way, but Null just pulled the rug out from under him.