I think the issue boils down to juxtaposition of character. Real men and “beta” men differ on integrity. A real man is going to be kind, protective, attentive, and generous but those things will come out naturally.
Betas project those things but it’s a fascade. They’re nice instead of kind, aggressive instead of protective, hypersexual instead of doting, and bombastic instead of generous. Evolution doesn’t favor them. They’ve just managed to weaken the gene pool.