> 2-3 decades of targeted marketing that shifted pretty much all concepts related to femininity or polite society into the lens of "gay and weird" for boys.

This and the another commenter who mentioned the social media algorithms tuned for rage-bait. People get sucked into this deeper and deeper in-group rabbit holes with targeted content suggestions. Its incredibly insidious. While I think this is a major major factor, I still think there is another issue for young men that make them more easily susceptible to falling down these holes in larger numbers than would be the case if things we're going better for them. I think there is an underlying hopelessness there that various actors are exploiting. It is this hopelessness* that is the true cause of this problem.

* Maybe that's not the right word. Alienation? Looking forward and seeing only barriers? I don't know.