They really hate being Londoners. There aren't enough electrons in the known universe to document how much. Which kind of underpins their stuck-in-the-past mentality about all sort of things.
There is a similar - but hopefully dying with old people - sort of vibe around Sandwell being created. Certainly 20 years ago it was a topic that popped up weekly on Radio WM.
When I started at Uni, a friend came from Sutton Coldfield. They semi joked about making sure I never called it "Birmingham" if I visited,
Of course coming from a city 30 miles wide and 20 high, it's hard to take such parochial pride seriously. Solihull ? Wolverhampton ? Ignorant Londoners would say "all the same to me". And given there are 9,000,000 of them, you'll be perpetually outnumbered.
Back to Susan Hall ....