I don’t understand how Christians can say ‘Jesus gave us a…

I don’t understand how Christians can say ‘Jesus gave us a gift we don’t deserve and could never earn’ and then tip a dollar because "The service wasn’t all that great."

This is a repost from over a year ago but if I had persistent piece of advice it would be this; "treat well the people that serve you."

I remember for a while the dollar tip thing was kinda popular. Do people still do that?? 🤦🏻‍♂️