There's not much more to say to you.
Just because it's the ESRB's job to rate games doesn't mean that a platform holder can't make their own decisions about underage girls in their video games.
And if you're okay with that being in a game just because the ESRB gives it "the clear," that's weird. It's wrong, period.
I don't like when when someone gets called names because they support certain freedoms. Like do you imply people who support first amendment free speech are pedo, nazis, etc.? Because first amendment allows all kinds of deranged shit to be made and sold.