A lot has been made of Boris Johnson's suitability, or lack of, in his candidacy for the post of Mayor of London, with regards to how he is seen by the Black community (see here and here).
Personally I don't think Boris Johnson is anything more than being his usual thoughtless self here. By that I mean I doubt he intended to be malicious, rather he just charged into a debate and highly important issue without stopping to consider all the facts, without stopping to think about the sensitivities of the case, and generally without stopping to think. Now some people think that Boris Johnson's bumbling behaviour is a political asset, that he is some kind of 21st Century Bertie Wooster! Certainly his former Bullingdon friends do, or else it would not be suggested to him that he stand for Mayor of London. But such silliness is not in tune with the demands of a political post, such as that of Mayor, nor are they an asset when it comes to needing to fundamentally deal with any form of racism or building bridges between communities. Boris Johnson may be in his element in a University or Sixth Form debating society, or even in the time of Ancient Greece or Rome, but certainly not in this day and age.