> My point is that non-white non-cisgendered non-male people are already doing this in order to exist in the workplace!

I'm struggling to see how the "Don't"s in the article are associated with a particular orientation, race or sex... are you suggesting that non-white non-cisgendered non-male people can't cope with a more casual tone? Why? In my experience non-"white" people are just as casual or formal as "white" people ("white" is such a weirdly American concept, here in the UK we wouldn't want to group the Poles and the French together).