Technology

1. it doesn't work, usually. When you go to people and call them racist, they will go defensive. Very few people actually think about this and try to find out what was racist and how they could improve. This is the experience of many marginalized groups, be it people who suffer sexism, racism, ableism, etc.

So because racism and being racist is rather severe, people usually refuse to acknowledge it, the first time. So a common response when people are confronted about a subtle racist stereotype is to say that they have a black friend or had a black girlfriend, and therefore can't be racist. So they understand the "hey, you are here a little racist" as "hey, you're racist, nazi". They don't see that racism can be subtle.

2. the point i'm trying to make is that racism is much more widespread than people usually believe. This is one of the thousand examples black people have to prove such things. So of course, we should work on that as a society and educate that. And one way of educating that is to provoke a public discussion about such terms as blackness/whiteness, maybe we slowly get to the point where the majority of the society listens and believes black experiences (which we currently don't, mostly). And the other important point is to remove the subtle association of "black/dark = bad" which a blacklist has. So the idea is to especially educate further tech-generations.