Dentist -is it just me??

I dislike going, but whats worse is being scolded and talked down to like a 3rd grader every time on how to brush you teeth/floss, as a nurse digs in your mouth.

I believe I take good care of my mouth. Brush/floss/gargle, all that stuff everyday. They never fail to inform me I have stuff in my teeth every time. You know why? Because as a human being, I EAT everyday. I'm 29, so maybe I should just give in, but do they just expect us to not eat?? What's with the demeaning tone??