that's a stupid point to make.
London is more multicultural than the rest of Britain.
even if you count the duo-culture the rest of britain has (Pakistani is usually what people refer to when defining "multi-cultural" in the greater context of the UK) then London is still absolutely outclassing everything else by an amazingly wide margin in terms of multi-culturalism.
You could argue the Polish influx has created a tri-culture, but really, I lived in London and my neighbors were Russian, Estonian, Finnish, Canadian, South African, Eritrean, Saudi, Indian, Danish, Italian, Brazillian and there was even a girl from Zimbabwe. Nothing like where I came from.. That's a true multi-culture.
Regardless, as a person having lived in 2 comparable places in different countries I see a huge difference in the way public spaces are treated (to the benefit of Sweden). I don't doubt that the parent has similar experiences as I wasn't saying it's uncommon. But I have this opinion having actual experience. If you do not have similar experience you are not an authority to tell me how things are.
I'm not sure what point you were even trying to make, that Britain has more than just British culture therefore my argument has no ground? :S