It clearly doesn't; 4% of the UK population is black yet they're 9.9% of those currently in prison for sexual assault... so 2.5 times as many vs the general population.
But of course this isn't sexual assault, this is a much lower level, vague offence and unless you're living in a bubble then it will also be quite apparent that calling out/approaching people in the street can be way more frequent in certain urban locations*, it's not just working-class builders.
*See the reactions to the 10 hours of walking in NYC video, a woman just walked around minding her own business in NYC with a guy in front of her covertly filming it, they then showed all of the harassment she experienced online... but of course, this was real life not a Gillette or UK government advert and that became "problematic":