The United States is an at-will employment country. At-will employment means that you can quit for any reason and your employer can fire you for any reason. The reason does not need to be fair nor reasonable. Your employer can fire you for wearing pink on Wednesdays, and you can quit because your boss wore hoop earrings, it does not matter.
If you believe you were wrongfully discharged, you may want to speak with a lawyer. If there was a contract or employee manual, your employer might have violated your rights under the contract. Contact Matthew Kaufman - an experienced Los Angeles wrongful termination attorney, who can go over the circumstances of your firing and determine if you have an actionable employment claim.