The term has been used by Trump supporters to discredit criticism of his actions, as a way of reframing the discussion by suggesting that his opponents are incapable of accurately perceiving the world.
Interesting. Labels like these (I guess the anti-Trump crowd uses similar labels for the pro-Trump crowd) seem to resemble the way the Borg labels critics. Attack the person, not their argument.
Then again, what do I know about USA politics.....not much really.