All the hairstylists I've been to use thinning shears on my hair!

I didn't know it was so awful. Some of my haircuts turned out decent. The one bad experience was while on vacation. Went to a random salon, and they thinned out like 90% of my hair :O

Can I just go to my regular hair salon and tell them NOT to use thinning scissors? Or will that just make the haircut turn out worse because the stylists are used to it...
Because I've found a stylist that I think is pretty good. She takes her time, realizes that I *don't * have straight hair, and my haircuts have never turned out bad.
But she uses thinning shears. And I wonder if my hair troubles are caused by that.