I don't think people were mocking or overcritical, just pointing out that yes, the OP was being unreasonable, which is what she asked. How is that reminiscent of children in a playground? That is an unpleasant thing to say.
There is no ganging up either. I know it can feel uncomfortable when lots of people post to say the same thing over and over, but that is the culture on GN, and to be fair, the OP hasn't engaged with the thread, so it's tempting to think that either she only wanted to be told she was being reasonable, or that this is one of those strange threads which show mothers and MILs in a bad light compared to their long-suffering daughters and DILs, who are only trying to be kind.
At the risk of 'ganging up', I agree with Norah, Iam64, Aveline, GSM, Urms and Baggs.