She meant it as a joke, to be patronising, and it backfired spectacularly - I think most could see that it might
The working man, with a terrace, a white van and a love of footie/the flag of St George has been the backbone of Labour for a very long time (despite Nu Labour having been run by North London Intelligensia for the past couple of decades) and she mocked it. Political suicide.......
Pedrito I expect your mother's 'char' had other, very good, reasons too!