It falls under the purview of harassment.What's the case? What law?
I posted 3 sources. One major news, one from an employment specific related lawfirm. All said it's perfectly legal to be a dick to your employees.
I've provided evidence. You haven't. Show your work.
Every succesful case I've ever seen has a protected class related reason, that it was successful. Which is why I keep mentioning protected class.