I have been sensing an overall attitude of elitism on Medium that has given me the same heebie jeeebies as you. Liberal and radical views, and ones even bordering on harassing, seem to be allowed while conservative views seem to be, at the very least, downplayed. Bullying, as you experienced, is okay, but only as long as it coincides with their views (Medium’s). In the case of your troll, he probably didn’t receive the same email as his seem to line up with my observations. Hopefully Medium will learn this soon.