I find the assumption that parents who want a certain gender are psychologically unwell rather insulting.
I don't think that because you chose to select and transfer an embryo of a certain sex, you are unwell. Nor are you if you're a bit disappointed that the child you've conceived isn't your gender choice.
What is wrong are people who abort a healthy baby which isn't the sex they want. That is crossing a line; a big fat red line. As is discarding unused embryos only because they are the "wrong" sex.