If there's anything to learn from the diversity conversation, it's that really, we're all quite different, and we shouldn't be afraid to act like it. Participants in monoculture are the real culprit.
Notable that in this instance where we're talking about opting-out of a popular practice, akin to sobriety or un-dyed hair, but followers of mainstream culture still treat it as a deliberate act.
If you look at the author's list, you'll notice that the majority of the items aren't "Hey, are you a lumberjack?"
It's not a "diversity" issue, it's an issue with prejudice - one which can manifest as an unconscious bias (i.e. dismissing with false equivocations between skin color and facial hair).
I think you're missing the point - choosing to have a beard (or weird hair, or be sober, or what have you) is a different than being born with a different skin color without any choice of your own.
Sure, one shouldn't be afraid to express their individual differences. But one also shouldn't be expected to explain a difference that was a) not one of choice or inherent significance, and b) is often fraught with extreme negative emotions because of the treatment one receives from it.
I have worn a fairly long beard at times. People did ask me about it. What people didn't do, as far as I could ever tell, was act in a prejudiced way towards me because of it.
Notable that in this instance where we're talking about opting-out of a popular practice, akin to sobriety or un-dyed hair, but followers of mainstream culture still treat it as a deliberate act.