The perpetual dilemma of standing at the school gates wondering whether to talk to the other mothers is something most mothers will go through. The dilemma presents itself if you are the odd one out. You will know whether you are the odd one out from day 1 when the other mothers flock like birds of prey towards the ones whom they recognise as being 'one of their kind' and tribal alliances are instantly established.
The tribes normally consist of 'mothers who live in the same area', 'mothers who shop in the same area' and 'mothers with rich husbands'. You don't actually have to do anything to be in or out, the criteria is some sort of unwritten rule that hangs in the air and is passed down each year by virtue of telepathy or, maybe, by an infectious virus that only certain mothers are amenable to.
The politics of the school gates, to me, is one of the worst demonstrations of the divide and rule system practised by women who have nothing to contribute except their own level of low self-esteem which is inflated into superiority. What is despicable is that these women often teach their children (daughters especially) to propagate the same in the playground.