I'd put "you pull, you tank" as a tank equivalent of a Sylphie; namely it comes about because of some puritanical view on the trinity roles, where someone gets upset that someone else pulled, after all, "they're not a tank". Whereas the Sylphie refuses to DPS because, well, "they're not a DPS". Either way it's a refusal to engage with the game, their chosen job, and puts responsibility elsewhere and not on themselves. They're opposing forces, but they ultimately come from what I think is the same source, a strict adherence to the trinity.

A YPYT is arguably worse since it's a refusal to perform their given role over a perceived slight, compared to a Sylphie who's instead super-dedicated to the role to the detriment of their own performance.