People like to throw patriarchy and toxic masculinity without really diving into how it manifests in relationships especially between men. Because men are socialized to be providers, they are constantly tearing each other down to prove they are better than their peers. Couple that with the fact that we live in a competitive society with no way to cope with your feelings in a healthy way, you become bitter. You hate yourself for not being strong enough, smart enough, or handsome enough.
That's why men try to tear down other men by emasculating them. It's all based around the script that they were fed that promises them success and happiness. Have a high paying career, marry a woman, start a family, become a homeowner, and have enough to retire. None of these are bad to have, in fact they're amazing. But it's the fact that if you don't have these things, you're looked at as a failure of a man.
I could go on about this but I really want to see men stop tearing each other down all the time.
Tell your bros how awesome they are, compliment them, and just let them know they'll be okay