In what world is posting the memo on your office door not “making a scene about it”?
Did he expect the kind of response he received? Sure, though I think hoped for better. But that's not making a scene. That's just not being completely acquiescent to unreasonable people.
Make it sound like a noble stand all you want but he was being needlessly provocative in an attempt to get the exact reaction he got and stir up controversy. It’s deeply tiresome.
If a left leaning English professor put up a lengthy memo on racial justice it would be dismissed by many as virtue signalling, as a distraction from their teaching, as a sign of an oppressive environment, etc etc. Yet when this is done by someone on the right the exact same people consider it the pursuit of some grand noble cause. Give me a break.