Gender disappointment is a real thing and while you can't understand it yourself it doesn't make it any less real and painful for the person, no matter how irrational they know it is.
Growing up I dreamt of being a mummy to one little girl, so that dream carried on into adulthood. When I got pregnant I found out it was twins and was so desperate for one of them to be a girl. Instead they were 2 boys and despite my desire for a girl, I was so happy about my boys.
However, as soon as we knew, the gender comments began...."2 boys? Good luck"..."Ha, 2 boys your home will be destroyed" even when they were were born and we were out shopping some random woman came over, looked at them and said "oh dear it's not 2 boys is it?!" And like the poster above said, boys would be "their worst nightmare".
The negativity from people, mainly strangers, really bought me down. I already longed for a girl and people like that made me feel worse. I felt guilty crying over not having a girl, when I knew people TTC, but as I said, it's irrational.
At nearly 2, I adore my boys and wouldn't change them, but the ache for a girl doesn't go away, but I know how lucky and blessed I am to have my boys, who I adore completely.