When that was first introduced, I seem to remember somebody pointing out that one of the original designs did have a black stripe... to represent those who died from AIDS.
I have to say, I can't really blame them for wanting to split off. I know I was seeing people saying they wanted to "drop the T" a few years back, but I'm surprised enough people are actually pushing for it now to get noticed.
I'm gonna... power level slightly, I guess? I attended college on the West coast briefly and got thrown into a history class with a rabid feminist who explained with great enthusiasm that Intersectionalism was birthed from the realization that the reason why feminism had such miserable success was because it hadn't hitched itself thoroughly enough to the civil rights movement.
Basically, according to her, the feminists realized they got dicked over (intentional pun, yeah, I know, shoot me) after they pushed for blacks to get the right to vote and women's suffrage was left in the dust for a long while afterwards. Apparently this divide was still on full display by the 60s and the civil rights push to end Jim Crow and expand rights for women (both sides were mostly out for themselves, although there was inevitable overlap).
As most people who've bothered to look into exactly how this abomination of a movement was birthed will tell you, lesbians were largely responsible for pushing feminism in the 60s. They've remained ardent backers and gay rights being added into the pot was the next logical step if you look at who was involved.
What I don't think any of them counted on was how degenerate men are and what would happen if you took a bunch of dudes, many of them severely mentally ill, pumped them full of hormones and self importance, and gave them political leverage.
The troon golem spawned by Intersectional feminism is now the MOST problematic to lesbians (suck girldick, bigot), and a big chunk of them want to carve out their own movement away from the troons.
Add the volatility of BLM to the mix and from the outside looking in (the only perspective I really have now since I can't stomach being around most of these people) it appears to be a house of cards ready to collapse. Whether current events will accelerate that or not I dunno, but there are absolutely fractures and I don't see how adding racial animosity over 9000 is going to help with the festering resentment that was already visible between the assorted tribes of feminists/SocJus adherants.