Voice, it's tricky (not that I'm telling you anything you don't know...and that certainly doesnt excuse the appallingly rude response you got)
Honestly as Juliette said, if I saw a bloke had on his profile that he had no children AND didn't want any, I'd be thinking well he clearly is only looking for a woman without children.
In terms of wanting children, I'm 40, I have 2 children, I would have liked a 3rd but it's probably too late for me now. I'd actually feel in some ways more comfortable dating someone who couldn't have children because it would remove the worry of what if we went from 'not sure' to deciding to try for a child and due to my age it didn't happen.
Thing is, there are loads of people who can't have children they just don't know it yet. I've a friend who is my age, with a similar aged DP. They met through OD. both want children, and would only date people without children. They actually have no idea if either of them CAN have children, they simply assume this to be the case (don't even get me started on how naive this is, but I can't believe they are the only ones who think that way....)