The only time I experienced racism was taking a vacation in Spain, in a place where there are a lot of french tourists. They get a lot of hate, and me speaking french got me treated like one of them.
I'm a very laid back, cool guy, and I'm usually the last one to get angry. But being at a restaurant and being made fun of randomly by the waiter, and then wondering if someone spat in my food, and having this impression that everyone hated me for now reason...
It was a terrible feeling. But I knew the only reason they were like that was because of a misunderstanding. All I had to do was mentioning I was Swiss or speak Spanish and it would stop instantly.
Now if I had been french, and I had no way to defuse the situation, I can imagine how frustrating it would have been.
Then I can see how things being like that your whole life must feel, specially when its something that stands out as much as your skin color.
I've been extremely frustrated on rare occasions in my life, and I've done things I would never thought I would. Karma is a thing. If people give you shit without a good reason, you'll do the exact same, probably to someone else, just to balance things.