Legal Question in Employment Law in California

Yes.

The employer is entitled to set and change hours, duties, titles, compensation, benefits, leaves, vacations, holidays, policies, rules, etc. just not retroactively. I admit that 48 hours is not much notice, but certainly not 'illegal'.

You can either comply, look for another job and then resign, or quit now and risk being denied unemployment. Not only are there no laws against poor management, 'unfair treatment', or rude, obnoxious or harassing behavior by management or other employees, but in general unless an employee is civil service, in a union, or has a written employment contract, they are an 'at will' employee that can be disciplined or terminated any time for any reason, with or without �cause�, explanation or notice. Any employee's goal should be to keep their supervisors happy and make them look good to the company, and make the company money. That�s how the company pays employee wages. If you don't, then don't be surprised to be replaced.