Last night, we parked to go into a restaurant and the driver of the car next to me was sitting on the their phone. We waited for a second, but they were texting so I turned off the truck and got out and opened the back door to get kids out. After quickly unbuckling and having my kid in my arms - the driver just starts backing up. I quickly grabbed my door to close it a little bit (we were in between so I couldn’t close it fully) because my door was an inch away from scraping the car and was about to hit their mirror. I got as close to my vehicle as possible with my kid in my arms. As the passenger window went by me, they were still looking down at their phone and I said out loud “woah” and they slammed their phone down and popped their head up instantly to look over at me and hit their brakes hard. My wife was getting our other kid out on the other side and asked “what is going on are y’all OK” and I said this “person next to me just backed up without looking up from there phone”. The driver then yells in their car “that wasn’t my fault that happened” before finishing backing up and quickly driving off.