This. Obsessive parochialism is the mark of the true Londoner.
And real Londoners don’t just not get the tube, they don’t even live in places on the tube map.
Also, the real divide is not the Thames but the Fleet: west London is basically Buckinghamshire.
It's a tradition as old as time, Toby. It means nothing at all.
In any case, we can all unite in agreeing that west London is the absolute worst, barely London at all.