Legal Question in Employment Law in California

You could look for a new job where you prefer the treatment. There is nothing 'illegal' about management being rude or obnoxious. Unfortunately, life is not 'fair'.

I suppose you could report the manager to the human resources department. The legal system itself, however, provides no remedy for people who must suffer under poor management.

it depends on what he/she says. I would suggest you talk to HR if it is offensive to you