No, hold on: like I said, many of these examples aren't shows of strength, they're shows of vulnerability. You're dismissing them because you've concluded they're legitimate, which is a special pleading argument.
Hmm, okay. I was about to say that there's an interesting question of whether "vulnerability is a kind of strength," but I'm scrolling up and seeing that the original claim was that both weakness and vulnerability are unacceptable. I would agree there are some narrow forms of vulnerability displays by men that our culture finds acceptable, so I'll concede this one.