Polygon does seem to like to revel in the role of the contrarian at times, though they aren't very good at it. As for them being racist, I don't know, but this Gies fellow does seem to have strong opinion of Japanese games, I'd say more prejudice than racist, his comment on vanquish screams that.
As far as the apparent double standard in regards to sexual content, I do certainly agree that gtav has more explicit content, by far, but it is different from bayo 2 and killer is dead, in that you can easily play through gtav and barely see any such content unless you expressly want to yourself. Bayo 2, and to a lesser extent killer is dead, it's an unavoidable truth of the games, the former basically beats you over the head with it, and the sexuality is presented in a far more voyeuristic and immature fashion.
That said, I do feel putting that much of an emphasis on the sexual content is a cop out and doesn't really address bayo 2 or killer is dead's more pressing issues as far as being games is concerned and does a disservice to their criticism as a whole. I can't speak to bayo 2, but I do feel the first is sorely overrated because of certain clunky mechanics and one of the most disengaging stories ever told in any medium. Killer is dead is a thoroughly mediocre game by any account, suda 51 may have an offbeat imagination that can be fun to explore, but as far as gameplay mechanics are concerned he needs a lot of direction to keep his bullshit focused and elevate his games from being more than mundane, cookie cutter hack and slash tedium.