Don't know if this is the wrong forum for this. I'm writing a script and I have described a character in it as "a tall black dude". Would that be considered controversial in the US?
Black should be capitalized, but it would otherwise be fine.
When used to describe Americans of African descent, "Black" is not just an acceptable term to describe them with, but is is in fact the preferred term - but when doing so, it should be capitalized.
To quote the New York Times, in a recent article they published regarding a change in their policy on the matter:
Decades later, a monthlong internal discussion at The Times led the paper on Tuesday to make, for similar reasons, its latest style change on race — capitalizing Black when describing people and cultures of African origin.
“We believe this style best conveys elements of shared history and identity, and reflects our goal to be respectful of all the people and communities we cover,” said Dean Baquet, The Times’s executive editor, and Phil Corbett, associate managing editor for standards, in a memo to staff.