Can a WI employer reveal a disability to the entire staff?

I have a disability that is not immediately apparent to others. I held a part time position. My employer switched the position to full time which I could not do. The agreement was reached that I would have to perform the full time position or leave. I opted to leave. I understand that this was an "at will" situation and that my employer was doing anything illegal.

However, I discovered that at a meeting yesterday, my employer announced to the entire staff that I would be leaving because I had refused a full time position due to my disability. She announced my condition to the entire staff!

I feel betrayed and wronged. Is this a breach of any sort of confidentiality or privacy law? Can a WI employer just reveal anothers physical limitations to the entire staff?