I don't know what kind of supervisor he is, but something similar happened at the facility I do part-time at. The nursing assistants were always c/o short staffing, etc., and they hired a new girl who was a bit on the heavy side [I assumed it was her heart weighing her down, because she was so kind to the patients]. At any rate, she came to me in tears and told me that the other staff members were treating her like the bastard at the family reunion.
SO, I sent her on break and collected the troublemakers [the usual round-up where I work--- many facilities have similar problems], put on my F.U. boots and started kicking. The rest of the night and the following evening, I took the new CNA with me to lunch, breaks, etc. [she had to wait outside the bathroom, though
]. What do you know, when I came back in two weeks, for my weekend, she was still there and loving every minute of it.
I don't know if its some type of sick initiation that they do [when I was a CNA I was always thrilled for the help, I would have worked with Jack the Ripper if he could lift well!].
If they continue to mistreat you, I would take the advice that my colleagues have already given to you and find a more supportive environment in which to work.