I mostly read (hard) sci-fi written by straight white dudes, so the tweet on the screenshot made me feel a bit defensive. In the replies and qrts people are patting themselves on the back for reading marginalized fantasy writers exclusively and this "consumption as activism" seems rad-libby to me, but maybe I'm wrong.
i think the point of the whole exercise is to expand one's reading horizons. LeGuin might not fill her writing to the brim with mind-bending imaginary future tech (the only real exception i can think of is the ansible which ironically was used by name by Orson Scott Card), but her social science and anthropology are much harder than the majority of the SF canon.