I'd estimate that anti-SJW backlash is a minority of the hate against TLOU2, and certainly not the driving force behind the anti-fandom that spawned multiple memes, tens of thousands of review bombs, and a nearly minute-long animation made entirely from parody fanart.  Most of it seems to be largely over dislike of the direction that Druckmann chose to take the story, and the belief that the game's central message falls flat.  There's also the concern over Naughty Dog supposedly mistreating its employees, Sony making frivolous copyright claims to try and silence the leaks, and the perceived hypocrisy of Sony's censorship policies.