I think Britain has become very conscious of racism, and it is written about and deplored a lot, so the impression is given that there is more of it around than there actually is. That is not to say that there is none around, or that it should not be discouraged whenever we come cross it!
It is rather like the image of Victorian Britain that persists, as a society which apparently invented sending small boys up chimneys and forcing women to give up control of their money, their children and every other aspect of their lives to controlling men. In fact it had been normal for small boys to climb the inside of chimneys to sweep them for centuries (though the chimneys were often wider ones in larger country houses than the cramped ones in Victorian towns), and for women to have few legal rights, and it was those Victorian "do-gooders" like Charles Kingsley and "The Water Babies" in 1862 who publicised their plights and made these abuses an issue so that they were put right.
With the publicity that made them a cause to be taken up, their existence was recorded for history just as the media publicity given to racism records its existence - and makes it seem that Britain is a very racist country - but it could be less racist than those countries that are not publicising and fighting it.