This is referring to a few books that were banned from school libraries a while ago (not sure what they were doing there in the first place).
Anyway, one of the books that were banned showed males sucking each other off. That's hardly something you would be eager to show a kid unless you are a groomer. A common theme between these books in general was that they were pornographic. The fact that there was, and still is an outrage from the LGBT community till this day because of the bans is telling.
Also, do make note of the people here comparing the bans to Nazi Germany. Yeah, not showing kids gay porn is like being a Nazi, apparently. Disgusting.
Ok so I looked it up and ended up skimming through the entire book - I wasn't planning to, but I got carried away because it's really good! Anyway, I'm not sure if I found what you were talking about. I thought maybe it was the scene on page 168, but that wasn't two males (one was cis female and the other was non binary and AFAB), and it wasn't both sucking each other off, it was one character wearing a strap-on over clothes and the other giving a blow job. Was there a different scene that I glossed over somewhere?
Nope, but that guy doesn't get outraged with the idea of kids being exposed to sex acts. They just get outraged specifically by the thought of them being exposed to gay sex acts.