In my DS's class we have:
"Conspiracy theory mum" - every single thing the school proposes is a personal affront designed specifically to piss her off ("Oh - I see they are putting all the notes on the website now - like all we do all day is sit looking at the computer")
"American Mom" - (To be honest we have it worse with "Former Investment Banker American Mom). We are just not that enthusiastic. We do not need "baskets of muffins". The unspoken tradition is that the Easter bonnet is made by the children themselves with items from Poundland - it is not a "project".
"Social climber mum" - she is v choosy who she associates with, which is No Bad Thing for the rest of us.