It's not comments within the thread but how the posters who got banned from Wiki and wrongly assumed it was because they were GC reacted to being told they were wrong behaved afterwards.
If you say anything they don't like or disagree with, you're no longer one of their gang.
I once contradicted someone who was a popular and frequent poster on FWR, nothing was said within the thread, but there was a VERY noticeable shift in attitude towards me whenever I posted in FWR after that. Everything I posted was either ignored or generated hostile responses until I namechanged when things went back to normal.
I've seen it happen a lot. (Not just on FWR, to be fair.)
There are several threads from black posters (which will be archived somewhere, possibly in Black Mumsnetters, but maybe in other parts of the forum) detailing how once they mention the fact that they're black, their experience of Mumsnet changes and they start experiencing hostility and being made to feel unwelcome. I'm not black but I distinctly remember a lengthy post from someone who said they had two usernames and that they didn't use different posting styles for either, they challenged racism from both usernames, but one username they'd admit to being black and the other username they'd let people assume they were white, and the white username got a very different response to the black username when they were posting the same stuff.
I used to have a username that could be interpreted as support for GC and while I was using it, certain posters would noticeably go out of their way to back me up and be friendly even on random threads about school lunchboxes. Obviously because having that username made me part of the clique. When I changed it that stopped.
Mumsnet is very cliquey.