I think you've over reached here. 'regular people I see on the street' is a general term and shouldn't be taken too literally.

Inter-ethnic relationships in England and Wales rose by two percentage points between 2001 and 2011 (7% in 2001 to 9% in 2011).

Ten years later, I expect the figure to be much higher but nowhere near as portrayed on TV. Let's be generous and say the increase has been 50% - and is still a minority.

https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...