I like to tip. I really do. I go out of my way to leave big ones for baristas, bartenders, and waiters who've earned something extra. I just don't understand why I have to. If "gratuity" is required, is it really gratuity?
And there is the key to Christmas joy. The little-known secret of Christmas is that our joy is full when we study and learn from Mary as servant, God as servant, Jesus as servant, and become servants ourselves. When we do, our joy will be full.
If we really wanted restaurants to pay their workers fairly, we would require them to pay their own workers and factor that expense into their prices -- much like every other business has ever had to do.