AJ & McCall: Calling Out Bad Tipping Debate @8

A dinner out with friends/family left AJ frustrated. He got the brush off for the check but not enough money was left for tip, so threw down some money to make sure it’s enough but how does he address it? McCall has worked as a server plenty so what would she suggest for advice for the Debate At 8? How do you pick this fight with your family, and why is good tipping so important to AJ & McCall?