The single biggest difference in the treatment there is, is based on wealth: in other words, one’s wealth is the single biggest factor for discriminatory treatment there is.
Anybody genuinelly wanting to end the unfairness of descrimination on things which people did not choose would be focusing most efforts (not all, but the largest fraction) on ending or at least reducing that which is the largest and most impactful discrimination there is (and which is often a pathway through which other kinds of discrimination end up affecting people: i.e. a group is marginalized on some visible trait, so many more in it are poor, and then most of the actual suffering comes from the differentiated treatment dependening on wealth).
Instead, “strangelly”, in those countries with voting systems that enforce power dupolies, the mainstream “left”-side party (which alternates in power with the “right”-side party) will at most loudly rage against a few other discriminations, never against wealth discrimination.