There are,what? 75,000 members of mumsnet?
If you get 75,000 people together, you will, I promise you, find some rude people among them.
Why do you expect that mumsnet would be different?
Rude people exist. There is nowhere that you can expect that you cannot find them.
However, most people on mumsnet are lovely.
But, I will be honest with you, it is a place where people do swear. and are blunt, and will say things you may not want to hear.
I love it. However, not everyone is the same. Many people don't like it.
If you feel that perhaps you're not suited to mumsnet, join here.