Id ban you also.
As the owner in the story noted, tipping is customary.
It's also voluntary.
Owners have the right to run their businesses any way they wish. If a restaurant owner requires every customer to tip, they should post signs saying so..."We will add a 15% gratuity onto bills." Then guests can decide for themselves whether they wish to participate by eating there.
This particular owner has an unseemly sense of entitlement. Thay does not speak well for his establishment or his service.
I totally disagree. It sounds like the owner respects his waitstaff, and I would expect that they will return the favor through increased loyatly / work ethic. He stood up for his employees; good for him.