the use is often ironic. Referring more to political affiliation with people who, perhaps, consider themselves to be alert to injustice and such. Like calling

the use is often ironic. Referring more to political affiliation with people who, perhaps, consider themselves to be alert to injustice and such. Like calling someone self-righteous. Also, I don't think the "especially racism" is accurate anymore (at least among the ironic use, which, in my experience, is the more common one). The stronger association nowadays is with like, positions about minorities among sexualities and gender identity, not primarily around race. Was this really unclear to you? Are you not exposed to this kind of use frequently?