'Johnson Family Vacation,' 'Barberhshop..'
I think it depends on the movie. Sometimes with certain story lines and two black actors, some white people will think it isn't for them. There was a children's book author who said this is especially true when parents are picking out book titles for children. If a black child is on the front cover, white parents will automatically assume it's a book about being black. Some people may go to a movie and if a black person is in a particular role, they may not like it because in their minds that's 'not realistic'. I bet they catch these things in test audiences though.
see my previous post # 17. The films you both mention are genre films that do not expect or need foreign revenues to make money.