There was a second factor in its creation that most people have forgotten, involving a power-tripping mod on /r/gaming. People were posting their gaming setups (both consoles and PCs) when one mod decided to ban all pictures of gaming PCs for a very stupid reason. So PCMR got a lot of initial subscribers from leaving the “dirty console peasants” behind, with that mod’s stupidity held up as a representative of the console community. Hence the joke, especially the “superiority” jokes.
The sub was created specifically because of the joke. It’s always been a joke. Who honestly believes that which system you choose to game on is a genetic or racial trait anyways? It’s a ridiculously exaggerated take on the “console wars.”