My girlfriend says I should tip in restaurants. I say waitstaff are just like construction and fast-food workers. Who’s right?

Today my partner spoke to me for the third time about why she disagrees with my belief and practice of not tipping waitresses.

To me, as long as all service staff are doing their job and getting paid an hourly wage, there is no reason to tip anyone, whether they mess up on my order or give me great service. 

I…