Yeah, they are saying she has alopecia, well, when I look at her in the video, she looks like she has a down to the wood brush cut. You can see stubble galore, so I don't get how they say she's bald because she's not bald. If she was bald, she would not have a full head of stubble, it would be just Q ball.
And for that matter, a huge number of black women will shave themselves bald and wear wigs. I believe Michelle Obama was one. Chris Rock even made a movie about black women and their hair desires called, "Good Hair" If Jada Smith was so insecure about her hair, she could have simply worn a wig.
I just think that Jada didn't like being the object of one of Rock's jokes period, and then she probably provoked Will Smith in some manner off screen because initially, he was laughing at it.
Smith lost his composure and as a result, he looks like a hot headed fool.