>Couple that with ever widening definitions of racist, sexist, whatever and you have an atmosphere where you’re always at work, which is a place you can say less and less

I don’t agree with a company firing you for having a side job, nor do I currently believe that this guys jokes are coming from an actual place of racism, but it’s pretty clear from the arbitrators statement that they’re one of “those” people.

The definitions of racism and sexism are not expanding.