I think you're illustrating the OP's point, though. Sexism disadvantages us all, which is what feminism is supposed to focus on. It's also frustrating to see these conversations get reduced down to black and white, as though those are the only two options in the world (if we're going to play Oppression Olympics, why don't we talk much more about Native American/First Nations women for example? Why don't we acknowledge Asian women's economic success in the US?). I also don't think it makes sense to speak of black and white like these are homogeneous categories when there are many differences within them.

Our goal should be to understand the ways in which our various identities make our experiences of sexism specific. But to do that, we need to actually listen to each other rather than project beliefs onto each other. My personal experiences with feminist spaces is that "intersectional" spaces instead do encourage Oppression Olympics. (The actual concept of "intersectionality" does not do this, but the term has come to be used very differently than what Crenshaw originally wrote about.)