Years ago, I remember going to a restaurant (alone) and an elderly man was sitting with his son in a booth nearby. The son was on his phone the entire time! I felt bad for the elderly gentleman because I could tell by the look on his face the he was looking for human contact and his son wasn't really connecting with him. I remember this whenever I am with another person so that I don't phub them. I think phubbing is as rude as it gets!