I think people just thought it was a hypocritical thing to say.
I don't think anyone has said PPs situation is 'no different to blending families' but that whilst blended families isn't always ideal (and I agree), neither is having divorced parents and you can't have a go at people for putting their love lives first when you admit two minutes later that you did similarly because you weren't happy with your own love life (i.e. didn't feel romantically toward their husband anymore). It's not as if divorce doesn't have a huge impact on children either so perhaps look at your own situation before you comment on others.
I also think this board is not a fair representation. As per PP, if you went on the relationships board you'd probably never date again as it comes across that all men are cheating bastards or abusive in some way. In reality we know that isn't actually the case but who's going to post 'IM SO HAPPY AND MY HUSBAND IS AMAZING'.
It's exactly the same here, of course you don't get people who are perfectly happy in their blended family posting many threads because why would they?
I for one am pretty happy. I get on with DHs ex well, they co parent great, she's very reasonable and nice. Kids are lovely and we have a great relationship, they absolutely love their sibling (mine and DHs DC) and everyone seems very very happy. So what reason would I have to start a thread here?
So I can't comment for everyone, but yes I'm sure it does hit a nerve, when people go on about how selfish you must be, when you are involved in a blended family that works perfectly well and all you care about is your children's happiness. If it didn't work well, I wouldn't be in this marriage. I appreciate some people stay when they shouldn't as evidenced by these boards and I definitely don't always agree with everything I see here but, and I can only speak for my own situation of course but I'm sure there are others, our children are not poor neglected souls who's parents put sex above their welfare thank you very much, they are loved and cared for and happy. And maybe some people would hate to hear it but I honestly believed if you asked my DSC how they'd feel if I left tomorrow they would be very upset, I'm not some awful witch who's a negative thing in their life. We have a great relationship, one I truly do think they benefit from and I think they would agree with that.