Are you in the US and does the firm have more than 15 employees? They likely are subject to title VII of the civil rights act. I am NOT your lawyer but I can get the facts and point you in the right direction if you would like help with this. (I’m a lawyer who stutters so this is something I empathize with). So sorry this happened to you. Sounds like a horrible workplace. The market is hot right now and you absolutely don’t have to stay.