That's 100% what happened. Don't forget that his entire writing career began because he read Hitchhiker's Guide and thought "I can write a better ending". Everything he's done in his adult life has been some form of cosplay. He can't even be a geek in a convincing way, which is something he takes a weird amount of pride in. He says he loves LOTR and even has a tattoo on his flabby shapeless arm but he's never read the books. He's seemingly not into gaming at all and only slurps up the most mainstream forms of geek culture that get pumped out, like whatever the latest slop from Marvel or Disney is.
All this to say he's fat.
This is why I hold to my theory that Patrick is a low-IQ sociopath. Sociopaths have no actual interests at all other than achieving social power. Anything a sociopath or psychopath claims to be interested in is only a pretence that is used to manipulate people or fit in with the insects (or children) that they regard other people as being. They choose their hobbies based on what participating in them will make people think about them rather than what they enjoy, because they only enjoy manipulating and dominating other people. They get their opinions from others and express them based on what response those opinions will get them from others.
Bret Easton Ellis used a great little Easter egg in American Psycho to illustrate this idea when Patrick Bateman expresses to another character that he thought Genesis improved after Peter Gabriel left. Nobody who is seriously into music has this opinion, but a lot of people who aren't interested in music only know Genesis from when Phil Collins took over on vocals and they had some pop chart success in the 1980s. But Patrick Bateman doesn't know this because he doesn't understand music or have any actual interest in it, he just knows that after Peter Gabriel left Genesis became more popular, so therefore he has concluded that the correct opinion to have is that they improved rather than just selling out. For those in the know that betrays the falsehood of his pretence of being an audiophile.
Patrick Tomlinson's best equivalent to Patrick Bateman's Genesis opinion is his tattoo. Fatrick knows that LOTR is popular, and he knows that the One Ring has some cool looking writing on it, so he got it as a tattoo so that other people would think he was into Tolkien. But like the other Patrick his lack of any real subject matter knowledge meant that he fucked up, and got the Black Speech of Mordor inked on his arm, the Tolkien equivalent to getting a swastika tattoo to convince people you're interested in history. But his choice of a very easily recognisable symbol also gives away his motivation. I have nerd friends with Tolkien/LOTR tattoos and they're all really obscure and usually in Elvish. And it's usually a passage that means something to them personally, whereas Patrick got a symbol based on its recognisability to normies (including him). It has no meaning to him, it's just there to build his "stealthy geek" brand, the image that he wants to project where he's simultaneously a motorbike ridin', knife fightin', teeth feedin' tough guy but also a heckin' intellectual and cool geeky guy who writes military sci-fi (chosen because it again crosses those two worlds) who respects trannies and has loads of liberal opinions whilst also somehow being a conservative.
Of course an actual smart sociopath would realise that those two identities are completely incompatible and choose one image or the other, but Rick is a fucking idiot. He's really fucking incompetent at being a sociopath the same way and for the same reason that he's really fucking incompetent at everything else - stupidity and alcoholism. When someone else has a nicer business card than Patrick Bateman, Pat B doesn't say "Nooo executive child, your business card DID NOT OCCUR, enjoy prison", he seethes and rages but remains externally calm, silently plotting his revenge. Fatrick, especially when he's drunk (i.e. whenever he's awake), doesn't have any self-discipline or self-control at all (otherwise he wouldn't be an obese alcoholic) so he spergs out, and because he's too stupid to engage in repartee, he just says "nuh-uh" over and over, including at literal news articles, and he doesn't have the necessary intelligence or theory of mind to understand how stupid that behaviour makes him look. And because he doesn't understand that he looks stupid, he doesn't understand why people laugh at him (sociopaths are not known for their sense of humour either, at best they will steal jokes). And because he doesn't understand that people laugh at him because he looks stupid, he assume his detractors are criminals conspiring to destroy him, because after all that's what
he'd do.
It would almost be a bit pitiful if he wasn't Fatrick, but because he's such a giant cunt to everyone it just makes it even funnier.