Null speculated that the way Patrick talked to this stranger on the phone might have been what he did to his ex-wife. I have absolutely no proof of that, and I don't have enough evidence to even think he did. But let's speculate about if that was true:
Patrick was doing things like going on a long tangent, trying to keep the other person from speaking, telling them that they have nothing to say and they know nothing, basically dismissing and trying to silence any contribution to the conversation. When interrupted or talked over, he'd get noticeably angrier and louder. He used condescending language like "baby" and "child" over and over, though at this point those things almost seem to be anxious ticks rather than actual insults. Every time he hears something he doesn't like, he has to immediately respond. Finally, there's the bizarre fake voice, presumably used to project superiority.
These are all things that, to a stranger over a phone, are totally ineffective and more amusing than threatening. Like if you say "you can't talk" they can just ignore you with no repercussions. But if you're in a domestic situation where you're married to the person, all of this things can be absolutely terrifying and effective. Even if you try to ignore or resist their "orders" they can punish you throw passive aggression, insults or abuse. If they talk down to you or over you every time you try to express a concern, it can make you want to stay silent. If you're insulted or guilt-tripped for disagreeing or speaking up, it can make you want to stay silent out of fear of upsetting them.
All of this would combine to make a living situation that's downright hellish. You couldn't speak your mind, express your feelings or make your own decisions without getting manipulated or gaslighted into submission.
I don't know if Patrick did any of this to his wife, and I'd never make the accusation in court. I'm merely saying if he did all this, it would be a fucking horror show to live with him.
It's also important we acknowledge potentially exculpatory factors: this was a complete stranger Patrick was talking to, someone whose part of an anonymous group of pranksters who got him so angry in the past that he tried to sue them (and failed). This caller had already manipulated and insulted him. And the reason he probably did the stupid fake voice and used all the weird mannerisms was because he was trying to uphold the internet persona he uses while "fighting trolls."