Dealing with CoWorkers

I was trying to assist a new supervisor at work on Monday.  I called another co-worker to ask if they were still at work since it was close to the end of our shift but I knew they would have the information I needed.  The second co-worker answered the phone and told me they were gone for the day.  I thanked them and hung up the phone.  Apparently, the second co-worker accidentally called me back.  I overheard her saying to someone else, "I don't know why that motherfucker called and asked if I was gone for the day.  He ain't my manager."  I just ended the call.  Nice to know what people really think about you.