Thank you for the explanation. I am truly sorry about this.
In general, I must unfortunately tell you that bullying is not illegal. No law requires employers to be kind, professional, or even respectful to the people who work for them. Hostility is only against the law when it relates directly to a legally protected trait, such as race, religion or gender, in which case it is potentially actionable under our civil rights laws. For example, yelling racial slurs at someone would give rise to a claim for actionable hostile work environment.
I certainly understand why you felt the need to tell HR about this supervisor's conduct, but doing so is not a "protected activity." This is to say, no law makes it illegal to retaliate against you for doing this. So, the situation you are describing is really one that boils down to internal company politics. Those politics can be unpleasant and even highly upsetting, but they do not give rise to any sort of legal claims. All you can do is continue explaining to HR how this supervisor is being unprofessional and targeting you based on a legitimate complaint. Most employers will recognize that this supervisor is toxic and take appropriate remedial action. They don't have to, though, and so you really need to focus your efforts on persuasion rather than legal remedies.
I hope that you find this information helpful and am genuinely sorry if it is not what you were hoping to hear. Please do not hesitate to let me know if you have any questions or concerns regarding the above and I will be more than happy to assist you further.
If you do not require any further assistance, please be so kind as to provide a positive rating of my service so that I may receive credit for assisting you. Very best wishes moving forward.