I started browsing Mumsnet whilst completing my Master's degree. I have always been concerned about whether my English grammar/language/pronunciation is correct. I am English - north-west so I have an accent, also had a lisp as a child, always got the picked on for this, believed I was rubbish at English, so achieving the Master's is a big deal for me.
There are really interesting debates on important topics on Mumsnet but I find the nastiness of people pulling posters up on grammar really offensive.
We need to accept that Mumsnet is an open forum for people of all walks of life, with different cultures, backgrounds and for some English as a second language. To continue to pick up on posters grammar means that some people will stop posting. This then reduces the variety of opinions and debate then becomes very narrow.
I am ashamed of my fellow Mumsnetters, please accept that not everyone has had the same education/interest in grammar as you, but their opinions are still valid.