Also in the UK - I've noticed a gradient in "aggression around cyclists", i.e. it's most awful in the south and gets progressively better the further north you go.
(I've never had issues when cycle touring in Scotland)
That goes for any "unconventional" outdoor sports really (i.e. anything that's not footy or horses). North is always up for crazy random shit, but good luck explaining paddleboarding or mountainbiking to someone in Cambridgeshire.
I can’t speak to Cambridge specifically but there are 4 B1KE mountain bike parks alone in the south of England (Wind hill, Rogate, Tidworth and S4P) so I’m not convinced of this north/south divide. There are others than just B1KE mountain bike parks too.