If a child/teen is ashamed of being black

The parents.

Other black people.

I'd also say the parents have a lot to do with it but things can get problematic when a black child is raised in an all white environment. No matter how much praise and security they might get from the parents, they may have a difficult time adjusting until they at least reach adulthood.

its no one answer. i don't think it solely rests on the parents, but something that, ideally, should be supported in all facets of that child's life, from the school to the home to the community at large.

your parents can foster pride in you for being black, but if that isn't supported outside of the home as well, then it becomes even harder. the same child that has encouraging parents may have black friends/classmates that deem them "not black" for a variety of reasons. and while it is easier for an adult to ignore that, for a child (and teen), those things are going to stick w/ them for years.

similarly, if they go to a predominantly white school system and are one of the few black students (or minorities), and endure micro/macrotransgressions constantly can start to be ashamed of their culture. and a young child or teen may not have the tools to deal with all that...hell, some adults don't have the tools to deal with it.

just my opinion.

I think everyone is right here. But the issue isn't blame because its a larger picture. The issue is how do you fight it?