can i get in trouble with my job if i am off work and a patient and i got into an argument while i was visiting?

i was visiting a patient at the hospital were I work. I was off work and the patient and I had a disagreement about her situation and she got loud and started cursing at me and telling me to leave and I did not curse her back, I told her she was not going to talk to me that way. I left and she called my supervisor trying to get me in trouble. I was called in for a meeting by human resources and I do not understand why, because I was off work and I did not physically harm or threating the patient. I want to know what can be done, because I do not believe I can get in trouble for not doing anything just because I work at the company.