Everything in life is relative. For example, yes, it is awful for someone who is trying and failing at IVF for a 1st baby to read about someone who is considering gender selection IVF. But don´t attack the OP by bringing your own or your friend´s situation into something that is completely unrelated to you or your friend! People come to Mumsnet for support. If you don´t like the subject, don´t open the message!
Women should look for solidarity, particularly in motherhood, which is so fraught with insecurity and lack of support, and stop judging and attacking each other on a maternal forum FGS!!