I think what you have to remember is that this is a GD board, and most, not all, but most of us that have GD have multiple boys with no girls or multiple girls with no boys and desperately want to experience the other gender. While GD comes in many forms, the PP is the "ideal" family combination in our society, which means most people with a PP not only get to experience both genders (again, what most of us on this board want), but you are applauded by society at large for having the "right" family while those of us that have 2 or 3 or 4 or more of the same gender over and over are pitied, made to feel like failures, and reminded over and over by unintentional (and intentional) comments that we somehow did it wrong or that something is wrong with our family. If you have a large family of all one gender you get treated like a freak show and constantly reminded that you NEED that girl (or boy). This board in a way becomes sort of a meeting place for those of us with 2 or more of the same gender not only to commiserate, but also to lift each other up and share the positives of having one gender when the outside world does not recognize the good that can come from multiple children of the same sex.
Before I had kids I at least wanted a PP so I would be "guaranteed" a boy and a girl. After having DS2 though, I can honestly say I love watching the brotherly bond (although I still very much want a daughter too) and my ideal has changed. I recently found out I am expecting boy #3 and it's been hard, but when I come here and have moms of 3+ boys (or girls) share the wonderful things about having all these same gendered kids, it really helps my GD. That is NOT to say there is something wrong with PP families - again, the PP is everyone's "ideal" in this society, what most people want. I have a brother and a sister and I have VERY special relationships with each. A brother and a sister can be super close, just as sisters can be super close and brothers can be super close. Each type of sibling relationship is different, but all are special and valuable.
I don't think anyone is bashing any PP moms that are on this board, maybe they are speaking about PP moms they know IRL. I know many of the PP moms I know IRL are smug, sorry. I remember one in particular who was in a group of us mom friends who had a PP (the only one who had a PP, the rest of us had only one gender) and she would always talk about how she was "so blessed" that she "got her boy and girl". Talk about making your friends feel like crap. Again, this has been MY experience. I have been "guilty" about talking about the positives of having other family make-ups including all one gender on this board, because I think it lacks in general society. We need more positivity about moms of 4 boys or 5 girls, because honestly I think it is pretty special and unique. Yet when they walk down the street they are treated like a freak show and reminded over and over that something is missing from their family, that somehow their family is not measuring up to society's standards. You will not have to deal with that.
And if I'm being honest, I'll say that I no longer wish I had a PP. I'm not bashing PP moms, just telling the truth. I'm glad I get to experience having kids of the same gender, I just want to experience girls as well as boys. I hope to be able to try PGD in a few years and I would really like twin girls, because I see the cool brotherly relationship my boys have and want to give a daughter of mine a sister as well. Again, this is just MY preference, and remember my preference has sort of changed over the years.