Employment Law Questions? Ask an Employment Lawyer.
Hostile work environment is actually a very specific claim under the law, as defined by the Supreme Court of the United States.
Though it sounds like it could apply in situations like yours, it actually only concerns situations where a person is facing constant harassment in the workplace AND that harassment is based on the individual's race, religion, gender, age or disability. The Supreme Court stated that all other matters of workplace harassment are not covered, because our employment laws are not meant to be a civility code, but rather, are narrowly focused on discrimination made illegal by statute.
On the facts you've outlined, your situation does not fall under the hostile work environment category, because you've not identified any protected category that you are in, and which forms the basis for the harassment you are feeling.
Regrettably, without something else, like a contract of employment that you are under, stating that you can only be terminated or demoted for cause, your facts don't reveal or suggest any legal action you could take here.