Some of the newest cars have avoidance monitors built in to warn you that a car is coming by or you're about to hit something. Most importantly you don't want to hit a person or animal backing up.
Years ago we had an employee who's husband worked as a driver for FEDEX. She told me that their drivers are trained to never back out of a space. I'm not sure if that's the current rule but it makes so much sense. So much so that I started to avoid spaces that require me to drive in and then back out when I'm ready to leave. Sometimes this requires that I park further away which to me is really not a big deal and I can use the exercise. So I scout for a space that I can usually drive into and then drive forward to the space in front to park. Then I can simply drive forward to exit. When I go the gas station to pickup something and not buy gas I never park in the spaces in front where I would have to back out. It may be rude but I park in a space in front of a pump; grab what I need and then safely drive away.
Think about it next time you park. Don't back up. Just don't back up. It's really simple to avoid a car insurance claim and most importantly to avoid potentially harming a person or animal.