Thank you for your question.
It's a common misperception that workers have the right to a non-hostile
work environment. However, the law is actually very heavily slanted in favor of the employer.
The reality of the situation is that the law does not require that you have a pleasant place to work, or that your bosses be nice to you, or even treat you fairly. So unless this situation is prompted by something which actually is illegal (which is retaliation
for asserting a legal claim, or actions based on discrimination
regarding race, national origin, gender, religion, age, and/or disability), then there is no legal remedy for you to assert.
Do you believe that your new supervisor's actions are based on illegal discrimination?
Do you have a written employment agreement which would otherwise prohibit your supervisor from asking you to work the extra hours?