I wouldn't have left my bike unattended in another aisle, but the guy was clearly being a boy donkey. I have taken my bike into stores before when I didn't feel that it would be secure given the area, or if I didn't have a lock with me. Once I was asked to leave it outside by a store employee, I looked at him and then ignored him. Tires on my bike are no more dirty than the wheels on the shopping carts. If the store were incredibly busy, I just wouldn't go in, but I've always done this on the way into work when the stores are not generally very busy.