It means “I get to break the social contract since no one is around and I hate being constrained by rules.” He’s neurodivergent, so he’s not the most clued-in on social contracts in the first place, but that’s not an excuse. He’s just a very weird person in so many ways though. He did not just decide to be a vegan, he decided to be a vegan who also will not eat fat or oil, and not because of animals, because he thinks that’s how humans should eat if they want to live as long as possible. He also once (again, publicly on Facebook) talked about how he couldn’t understand why no one in his work zoom meeting thought it was funny when he showed off the REAL HUMAN SKULL he somehow owns because apparently it’s really funny to own, again, A HUMAN SKULL.