Do I need a defense? My bad memory for faces is universal, not specific to any one ethnicity. Indeed, I had the hardest time following the plot of Veronica Mars in its first several episodes because I couldn't tell all the generically good-looking young white guys apart. And when I binge-watched the first two seasons of The Magicians a few months back, it took me several episodes to figure out that Margo and Kady were two different women. When shows have large casts, I just need a few weeks to learn the faces and names well enough to tell people apart. Of course, Black Lightning doesn't have that same problem, because there are no other regular characters who look anything like Anissa, but sometimes I'd see her in a scene and it'd take me a moment to be sure I was seeing her and not some guest character. Now, though, as I said, I've learned her features well enough that it's easier to recognize her.
The other day, I went to the bank to do some business, and I talked to a banker that I'd previously only met once before, several months ago. The only way I could remember that I had met her before was that I had her business card; otherwise I would've had no idea, because one meeting is not enough for me to learn someone's face. But she recognized me right away, which surprised me, given all the hundreds of customers she must've talked to in the interim. Since I'm not good at recognizing people, I don't realize how easy it is for most people to do it. I kind of envy that skill.
I have the same issue--even with famous actors in make-up. I didn't even know that that was Cate Blanchett in Thor until my wife pointed it out to me half way through the movie.