Never take action based on "legal advice" from strangers on message boards. And never threaten legal action unless you have a lawyer lined up to take the case. There is no law against maintaining a hostile work environment per se and complaining to government agencies won't accomplish a thing. In an employment at will relationship, maintaining a hostile work environment is not legally actionable unless it can be tied to discrimination based on race, sex, religion, age, disability, or some other protected category established by state or federal statute.