If you have a good friend who is foreign (or even just has a different regional accent) and you know they can take it as intended then it's okay to partake of a little light hearted mocking; but in an environment like that and with someone you don't know it's both highly unprofessional and tantamount to bullying.
At the very least someone should have pulled that professor aside and told him that his behaviour was not acceptable. There's a time and a place and that was not it.
As someone who struggled in university in another language, I am glad that this is not acceptable behavior anymore.
For me, this is something deeply personal. It took me a long time to be comfortable speaking another language and I can only imagine how they felt in that moment.
This is a step in the right direction and you should be fighting to keep your job if you find this kind of behavior acceptable.
> "Nowadays," Rodríguez notes, "I would have filed a grievance against [this professor] so heavy that he would have had to sell his soul to remain employed."
It must be fun to be a member of a humanities department today. I imagine everyone is surveilling everyone else for a slip up (microagression) in order to destroy them.