Movie about "Human Unity" that has a racist joke in it?

Not saying the movie was bad in any way, just found the off hand joke from Shuri refering to Bucky and the only important white character in the movie as "White boy" is racist. Might be reverse racism, but either way the term "White boy" is never used in a respectful manner. I am a 28 year old army veteran born and raised in Chicago and people think it is ok to refer to me as "white boy" but if a I refer to a 5 year old black child as "black boy" people lose their minds. I found it's use in the movie, especially as a moment of levity, was tone deaf to itself. In the end, my gripe is with the world and its use of the term "white boy" and how this movie, being praised for it's message of unity, seemed to allow it.