It's funny -- about 8 years ago I remember this exact same issue came up, but the other way around. There was this guy, James Damore, basically a republican who said the diversity program was grievance politics or whatever, sent out a memo to hundreds of other employees, created a kerfuffle, ultimately was fired. He sued and retracted.
Anyways back then I felt some sympathy for the guy, talking politics at work, because as far as I could tell he was a good-faith free-speech proponent. I even wrote a blog post about it and shared it on this site.
However now seeing how much the tables have turned, and how little that cultural swing had to do with free speech, I feel embarrassed about my past self. It's incredibly clear to me that at most a small % of those "free speech" advocates are genuine, because I never see them speak up for the other side (like I did).