I'd say it could backfire. It's a racist statement in and of itself.
I have a black girlfriend whose use of the English language is extensive (this gal owns the language in ways that astonish me) and very, very precise - no doubt because her father is an English professor.
She says she’s “multilingual”, because she can use the “Black vocabulary” also. She had to learn it though and she uses it to build a bridge to certain people, but she hates it.
She has to watch herself, she corrects people’s language usage out of habit. I don’t mind, some of her black friends are very offended.