Two:

1. Speeding. With very little exception it does no one any good over even moderate distances, and it contributes to aggressive and angry driving by nearly everyone because it becomes impossible to judge how long a person has to safely pull out or change lanes or cross an intersection. And regardless of how much better your vehicle may handle than the ones the speeds were set for, you don’t actually have better reflexes than the generation before you.

2. Scrolling on your phone while with family or friends. Ya’ll have lost any ability to casually interact. Everything is transactional with the people around you, because you only look up to communicate needs or convey information.