Whatwould,
My personal opinion is that there is a massive element of intersectionalism in racism in the U.K. if you are a well off, well educated black person (say an Etonian), I would say you are actually in a very privileged position.
Universities are crying out to address Lack of black students, so you will probably get a lower offer and many top employers have programs to accelerate the progress of ethnic minorities (and your parents will probably have white cleaners, gardeners etc).
However, I do believe that if you are black and underprivileged in other ways as well, you have the worst of all worlds and racism is a major factor in your life.
However, all the above is just my opinion and based on my personal experiences.
The point is, that in a school, whatever your opinion is, it should be heard and discussed with courtesy. I suspect that is hard to do these days without setting up the rules of debate carefully. A teacher maybe cannot do that in a regular lesson.