Before you try excusing this behavior with whatever excuses you have, see if your excuse still stands after asking yourself this:
Why shouldn’t the girl open the car door for the guy?
Back in the days when my wife and I were dating, my car was not equipped with electronic locks. I had a key, and the doors could be unlocked from the inside by pulling the button up. I always unlocked and opened the door for the girls I dated; I then noted if the girl leaned across from her seat to unlock my door from the inside. The girl I married was one of the few who did.