To me, it seems objectively easier to pull into a parking space forward and then back out of the space when you are ready to leave. You don’t have to line up with the lines while driving backwards, and it’s easier to keep from hitting other cars as well. So why back in? To me, the only advantage I can think of is that you can get out quicker, technically.
Edit: I do not need driving instruction, just wondered why. The reasoning.
I really hope that parent used that as a learning experience for the child. I remember my mom screaming at me for running in a parking lot, and for a good reason. It’s dangerous AF. I learned my lesson pretty fast.