Those are three totally different situations, but the Foundation for Individual Rights in Education (FIRE), a nonprofit that fights against this plague of supposed anti-free-speech activism, lists all those types of incidents (and more) as "disinvitation attempts" on their website.
Let's make the difference clearer with some examples. One time, Christine Lagarde canceled her talk at Smith College because she didn't want to have to deal with protesters, and the protesters were surprised and disappointed by her decision, both because they were looking forward to having their ideas challenged and because protests are fun and they had to find a new way to spend their weekend. In another case, Berkeley canceled a Milo Yiannopolous talk after 150 (probably) non-student protesters caused $100,000 in damage to the campus a few days before the event. Both those stories are worth discussing, but simplifying them down to "College students are banning people from college campuses!" isn't just lazy; it's factually wrong. Also -- and I don't think this can be overstated -- college kids are really young. They're just learning how to ... well, everything. Keep that in mind.
So while I (and every other progressive I know) would agree that it's a bad idea to "ban anyone we disagree with from college campuses," I think it's lazy to pretend that's where the conversation ends, because we also can't say "Shut up and listen to anyone who comes here" to students. They have a right to protest, which is how they exercise their free speech. If there's a simple, one-size-fits-all answer to this, I'd love to hear it.
Right after we talk about how Rubin also said ...
"[Progressives are] prohibiting any words not approved of as politically correct. That's not progressive."
Again, I agree! Banning words sounds like a terrible idea, especially to a guy who writes words down for a living. I'm already no Cormac McCarthy; the last thing I need is a freaking handicap.
Again, Rubin doesn't cite any examples of this actually happening, so I looked around and found The New York Post complaining about the University of Wisconsin-Milwaukee's "Just Words?" campaign, which is apparently "banning" non-PC words across campus. "Banning the word is an effort to ban the thought," the editorial board writes, "which is the real point."
Students know plenty of ways to "ban thought" already.
And yes, a word ban seems like an ill-conceived idea. Mostly because it was never actually conceived. When you go to UWM's website, or just read slightly more sober coverage of what the college did, you'll discover that the "Just Words?" campaign was actually just a few posters and an optional event where students were invited to come and discuss what words mean and whether it's polite to use them. Which is literally the opposite of censorship, right? It actually sounds more like "an uncomfortable but important conversation," or "exactly what college is for."