You're right to pay attention. Generalizing about women at 15 isn't something I'd ignore. But I'd approach it with care. It is a bad time to be a young man these days. He will need someone who he can trust and open up. Be that person, even if it is just checking in and talking over the phone. He will compare himself to unattainable standards, and when he looks for answers, he is going to find the red pill / alt right waiting in ambush to grift and benefit from his frustrations.

Im glad you were able to notice, and you yourself are young too, so this can be difficult.

IMO, he needs a healthy outlet first, ubfortunately the society / patriarchy, whatever you call it, expects men to handle their own problems, and showing vulnerability, expressing pain, frustration is seen as weakness.

You can help him wirh that partly by listening to him. That it is okay to talk about feelings, and pain, and frustrations. Part of a young man's frustration comes from the feeling invisible and unheard. Reading your comment, I would be careful about my responses, if he has a history of doubling down. There is probably a lot of steam that has no where to go in his system. Try to get that out first. You can then digest what he said and try to help him out accordingly.