Nah that's not it, he just enjoys being the little devil on everyone's shoulders. He's retarded like everyone else at that twitter brained company, sure, but he's not really that immature himself. It's impossible not to notice that he's very, very rarely ever been the one to personally do retarded or destructive or self-destructive shit beyond being a loud angry cunt every once in a while, but he loves encouraging it in the people around him.
Like he's always pushed people to drink more and more and more, especially with Jeremy even after Geoff's alcoholism issues came to light and Jeremy's own admissions it was becoming a problem, though he never gets wasted that much himself. Or how he basically dares people to up the stakes with their antics, like the aforementioned desk incident, just so he can complain about the state of the office and call them stupid animals later later. Or makes a bunch of little needling comments whenever other people started actually arguing and getting mad at each other. Or happily sitting through his wife transitioning into a sweaty hambeast, though that could just be what he's into.
Maybe because it lets him feel superior, maybe so they can make a show of it and get Content™, maybe both, maybe some other reason idk I'm not his psychologist.