https://www.youtube.com/watch?v=PuNIwYsz7PIFirst off, this video has the worst like-dislike ratio of any Oliver video I checked, and I checked the more popular videos. With 1.9 million views in two days, this segment has been heavily viewed. Because Oliver chose to play about a ten second clip of some controversial people (Anita Sarkeesian and Brianna Wu), his video has been flooded with comments about how that was a terrible decision and what terrible people those two ladies are...proving his point. Certain segments of the population seems crazily determined to establish some sort of "bitch had it coming" justification for the crazy stuff that's happened to Sarkeesian and that alone is a good example of why John Oliver's segment is as important as it is.
In a civil society, a person should be free to express their opinions without threat of bodily harm or death. If you disagree with someone, criticizing that person or even organizing a boycott of that person are acceptable responses. Trying to chase people off the Internet and hunt them down in their ordinary lives for having the gall to express their opinions is monstrous. Thank you John Oliver for picking examples for your segment that would get this exact response so you could show the Internet just how ugly it has gotten.