Is it considered harassment if an employee is repeatedly asked to do things without any prior notice ?

A fellow coworker called in sick. The shift was covered that day, but due to previous plans made by the covering employee, it was told to the direct manager that if there was another sick call the following day, it could not be covered. That was noted and that was the end of the conversation.
The following day the sick call came. This was never mentioned to me. Not until the shift was halfway over was it explained that a non direct manager would have to cover. I was asked to stay as late as possible, so I explained I would do what I could.
After the manager left, the person covering was very upset and asked why I was not staying, saying it was my responsibility to do so. I explained they already knew I could not. I was also told to cancel plans after work for a possible call the next day. Is this considered workplace harassment?