Apologies, I don’t think I can easily find the talk. I did some cursory looking based on what I could remember of the talk before posting. I like to link to things when I can.
Worse, is the topic is a current lightning rod for alt-right, so there’s a lot of garbage to sift through. I will see if I can get lucky and find the talk again.
Edit:
mrosett answered this. Yes it was a lecture by Greg Lukianoff of FIRE. I might have been click-baited to watch it, but he seemed credible enough to quote, and seemed to genuinely care about actual free speech.