It might me the case of correlation. They think all diversity is bad because a few shows with notably diverse cast were bad. For example, in DA:Veilguard, there is a companion named Taash, who is non-binary, who acts brattish and manly, despite being biologically a woman. I admit that some of her dialogues can be classified as cringe, but calling an entire game bad because of one badly written character is kinda stupid, IMO.
I love this quote a lot, "Art disturbs the comfortable and comforts the disturbed." I am only paraphrasing it here, but you get the gist.