It is a bit lazy. But it's also a meme and not a thesis. If the purpose is mass communication, resonance is more important than rigor.

More to your point, I don't think capitalism requires racism but it does require some sort of superiority dynamic within the working class. The more, the better. This takes form in misogyny, racism, ageism, ableism, and pretty much any other discrimination you can think of. All will be propped up by the inherent incentives of capitalism in order to keep the attention of the working class off of the business owners actually causing the problems.

Lol you're going to have a bad time looking for logically coherent memes. I think the implied elements here are: Exploitation of C is required for A. Exploitation of C is not possible if C is unified. B enables division of C, therefore A requires B. It may or may not be true but it doesn't hold up to logical analysis (e.g. B is probably not the only way to divide C)

Capital as a singular structure is trivial to spot and the overthrow is achievable. Add in secondary power structures like race and sex and now people will point fingers in a circle before even realizing capitalism is a problem. Now you want to unite people against capitalism? Even harder, they have other problems they view as bigger, more personal.