What is your opinion of doctors sending away patients that refuse to follow orders?

In the story linked, some doctors are ‘firing’ patients that refuse to vaccinate their kids.

This discussion could be applied to any situation where a patient doesn’t follow doctors orders. (EX: lose weight or get diabetes, change diet to lower BP-etc)

Is this ethical? Does it go against the Hippocratic Oath of do no harm?

Is it a necessity to get the patients to create a healthier lifestyle?

What’s your take on this?
Thank you in advance for your answers!