All these people questioning why he wants a son, would they say the same if you wanted a girl?!?
I would, and have, under various other user names.
Gender disappointment is rooted in sexist stereotypes, and as such I would have no sympathy for anyone who expressed that they had wanted a cild of a different sex.
My ex had said he wanted a son who would walk along and hold his hand (when young) and look up to him (meaning hero worship as well), who would show an interest in cricket and rugby, etc, etc. All "me me me" basically.
What he got was a son who never wanted to hold anyone's hand, didn't hero worship his dad (dad is abusive, so no surprise), and who absolutely hates team sports. And who ultimately doesn't have contact with his dad, by choice.
Girls and boys can do the same things, the only barriers are those created in our minds by the sexist steroetyping.
(I also have a DD. I'm not that fussed if I don't get to go wedding dress shopping, it's not a big thing to me.)
All children should be valued for who they actually are, not who we want them to be.