That's not even Jojo. There are plenty of (relatively) adult-oriented fandoms that flip their shit over mature content too: Grand Theft Auto series, Silent Hill series, the Far Cry series, BioShock- I was ready to bust a gut when (even before it was released) people were screeching about misogyny because the first level of Detroit: Become human involved a little girl being held hostage. Would you have rather the bad guy been holding a gun to the head of a little boy? Would that have been more acceptable to you?
I just genuinely do not get it. Video game series like Far Cry are known for their mature content and their villains. Silent Hill is known for its graphic, horrific violence and imagery. Detroit: Become Human was very clearly stated to be an M-rated game that would deal with topics like slavery, violence, and civil rights. And Grand Theft Auto- fuck, I don't think they've had a game in that series that hasn't been controversial thus far.
Why would you even play these games knowing that this is the content? Why are you morally posturing about a game whose shtick is "fucked up violence and sociopathic characters"?
And these people will preface every pissy, self-righteous rant they make with "oh I totally love the game b u t" They want me to believe that they love this Thing so much, but over half the time they talk about it they're complaining about it. And if you suggest that maybe they should A) stop engaging with the media that offends them so much, or B) restrict their bitching to their own blog/personal groups so the rest of us can enjoy the thing in peace, they lose their minds and insist that we're "refusing to acknowledge" the problematic aspects of the media and are therefore problematic ourselves.