Say What?!

While getting ready to wheel my mom out of the eye doctor, I say to Austin who is standing against the door.  "Hey buddy, open that door up so we can leave."  There is a man standing between us at the check in counter who apparently doesn't realize Austin is there.  He looks at me shocked/embarrassed and apologizes then goes to the door, which is now being held open by Austin.  I say back, "Uh thank you, but I was talking to my son."  I laughed all the way home.  Maybe I need to reconsider my use of the word buddy....