Earlier quoted context omitted.
My two cents here: non white people can certainly be racist, but racism is a structural thing, so it doesn't make sense to talk about racism by people that are not white, in the United States, since the structure isn't there. But I think it makes perfect sense to talk about it in other places.
Racism is a not a "structural thing", and neither is it about whites or non-whites. Everywhere you go on Earth you will find racist people, whatever 'race' they are some will be racist against other 'races'. Specifically regarding your point: there are people who are black and racist in the US or any other country.
There's a very important distinction to make between those that write the laws and those that don't.