This, sadly, is rather true. There are exceptions to this... but they're firmly outside of the capeshit genre ('Love and Rockets' and 'Strangers in Paradise' come to mind for me).
Strangely, I don't see anyone on either side of CG pointing out books like Terry Moore's bibliography or the Hernandez Brothers' magnum opus as examples of books with genuine diversity and themes that would otherwise be classified as socjus pandering. Much less other comics/graphic novels, like 'Fun Home' (which has a hugely popular Broadway musical adaptation), 'Persepolis', Rana Telegmeier's entire bibliography (which outsells capeshit by a huge margin), 'American Born Chinese', 'Saga', etc. Even 'Meg, Mogg, & Owl', ffs. I guess if it's not capeshit, it doesn't fit either narrative.
And really, that's what this largely boils down to: cape comics are the big genre when it comes to Western comics, ergo the socjus types believe that crowbarring their ideology into it will do... something. They don't see the forest for the trees, and don't lift up the creators and titles that actually check off all the boxes next to their demands. And the pro-CG crowd aren't pointing these aforementioned titles out as good examples of what the comics medium is capable of and encouraging them to do what they're doing: make/crowdfund their own comics with the stories they want to see.