I don't see progressives saying that white folks shouldn't talk to POCs. It's that there are far too many white folks telling POCs what they "should" be doing politically and precious little listening. And, yeah, splaining. So its not STFU -- more like STFU and listen for a change. I don't view listening to underrepresented points of view as a loss of my free speech.
If I see a person speeding toward a cliff, let me consider whether it would be bossy of me to tell them so. I am always telling people what to do because I assume that what I have to say is so important. Maybe I should just keep quiet this time.
Or maybe I am just a guy on a little discussion board who posed a question I was curious about. If our POC Trump supporters here are willing to share their reasons for continuing to support a wannabe authoritarian leader who has given lots of confidence to actual Neo-Nazis and white supremacists to come out of the shadows and run for office, then I am all ears. Excuse me for presuming to bring to others’ attention the fact that Trump attracts and enables hate ideologues, and it is thus a poor idea to support him. I am awaiting further enlightenment from those truly in the know.