You’re missing the point. He did those things and isn’t a complete and utter tool as a result. They aren’t his identity or opportunities to “be manly.” They were acts of service.
You’re missing the underlying assumption, which is that military and football are for men. They’re “typical man things” and Walz is showing that a man doing manly things doesn’t have to be an asshole.
But that still assumes there are manly things, that armed service and football are manly. Subtext.