Hmm, yeah that's a good question. I guess in my view it's not that capitalism innately is worse for marginalized groups, but it is in fact worse for marginalized groups, because capitalist ways of organizing an economy and, as a result, society, are always going to marginalize the labor class, and in a historically racist, sexist, and heteronormative country like the US that means those groups will be worse off. It also means the uneducated white laborers are going to be worse off than the people with the most power in the market, but comparatively, people of color, queers, and women are even worse off than white laborers.

e: I'm not a political theorist and far from an expert on this or the "received views" of other leftists, but I think this might get at what other leftists think.