A lot of them absolutely do learn those skills the same way I did

But for a lot of parent/child relationships, being gay can still be a pretty big stumbling block. If your dad is rejecting you, doesn’t want anything to do with you, maybe even kicking you out of his house, you’re not going to be able to learn anything from him. If he’s overall supportive but worried about not wanting to push you into traditional gender roles and ideas of masculinity and such that you may not identify with, he may not try hard enough to pass those skills on. If a kid coming to terms with his sexual orientation feels pressured to act a certain way because of pressure from his peers or society, he may push back against his parents trying to teach him those skills, etc.

It’s not unique to being the father of a gay son, lots of parents struggle to find ways to bond with their kids who have different personalities, interests, opinions, etc. than they do, but being gay can throw an extra level of complications into the mix and so I suspect you’d see it at least somewhat more among gay guys than otherwise comparable straight guys.