I'm kind of sitting on the fence here so I thought the MN jury could decide who's being unreasonable (I am not one of the people involved)
There is a shared house with 6 occupants and two driveway spaces, and some spaces usually free in the street. It's just a case of whoever gets home first gets the spaces on the drive and all the occupants are satisfied with this arrangement.
One occupant (A) who lives in the house is going away for the weekend. His car is parked in the street. His mate is coming over in his car and they are getting the train to their destination. His mate parks on the drive as everyone is at work, and when the other occupants get home they complain about the random car taking a space.
They send message to A asking why his mate has parked on the drive, and he says "what difference does it make, my car could have been on the drive, but I parked in the street, and my friend used the space on the drive".
Who's being unreasonable?