Thank you for the information and your question and I am sorry to read about your situation. Although I can certainly understand your discomfort, nothing in what you have described after returning to work is unlawful retaliation. In order for their to be some sort of unlawful retaliation you must be the victim of "severe and pervasive" harassment, or there must be an adverse employment action (such as a demotion, negative change in hours, reduction in pay, etc) taken in your case. Until those events occur, there is no legal recourse related to what you described.
That doesn't make it professional, but despite what you might expect in the workplace, there really is no right to a genial, professional, comfortable work environment. That is not what the law requires. It only requires that there be no violation of wage and hour laws and discrimination laws (which again require the types of actions I described.) "Severe and pervasive" harassment is much more extreme than what you described, which is admittedly not professional, but also not illegal.
You might reconsider whether or not you want to continue working for this employer and if not, start trying to find more acceptable employment elsewhere while you are still working so that you can make your transition when you are ready.
Please feel free to ask for clarification if needed. If none is needed, then if you could take a moment to leave a positive rating in the ratings box, I will receive credit for assisting you today. Thank you