Kate Bornstein faced the same thing as Dreger (though with just a couple dozen protesters) when she came to speak at my college a few years ago. Somewhat similar to Dreger, she stopped her talk and asked the students exactly what their objections were - she was surprised, becasue she had been accustomed to Right-wing anti-trans protesters, not misinformed trans activists. She corrected their misunderstandings, and most of them sheepishly departed, while a few stayed to listen to the rest of the talk.

I don't consider this group to be Left-wing at all. They are Right-wing authoritarians demanding their preferred positions and perspectives be elevated to a level of dominant cultural hegemony; they just happen to belong to marginalized populations. They tend to be essentialists who reject the ways identity is socially constructed and mediated. I'm most familiar with this subset in trans and Black activism, due to my own areas of focus, and they've definitely come to dominate conversation on platforms like Tumblr and Twitter. Thankfully, since the 2016 primary brought class materialism as a framework of social analysis back into the public consciousness, I've seen a lot more Left-wing pushback against this kind of stealth Right-wing activism, though of course we've had the likes of Adolph Reed and Jack Halberstam (just two names that jump immediately to mind - there are plenty of others) objecting to this appropriation of the Left since the start of this shift (to my recollection, the essentialist identitarian backlash started in the 2000s and intensified in the 2010s as something of a backlash to the 1990s project of making everything queer, bolstered by the wider public's appropriation of ideas like microaggressions, trauma triggers, etc., which original academic conceptions bear little resemblance to their pop culture formulations).

I used to make arguments similar to Rich, back when college administrations would just reaffirm their students' right to protest but wouldn't censure instructors or modify campus policy to protect the sensibilities of any/every member of their student populations from offense. However, the calculus has changed now that the response has changed at many institutions, and I'm personally worried because, throughout human history, the policing of thought and speech is inevitably deployed by the Right to suppress Left-wing dissent to a vastly greater degree than the opposite (indeed, I think that this kind of policing is inherently Right-wing, hence my appraisal of this group as stealth Right-wing activists, but this is true even if we only consider the causes that are suppressed or supported and whether they are identified more with the Left or Right). I'm glad for the efforts of older (as in older than college students) activists like Dan, who have the benefit of perspectives informed by a wider range of social conditions across time, to serve as a corrective for this recent impulse in putatively Leftist activism.

+2 to Mr Smith for the correct pronunciation of "aunt", but the programme just doesn't work without Mr Sanders.
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Mr Horstman's game of Pin the R on the Donkey seems to belong mainly at a theological conference. It's interesting, but too unlikely to become relevant in a timely manner.