My hairdresser does the same thing!!! It makes no sense to me - the faster they grow, the sooner they'll lay down and blend with the rest of the hair, right? I finally said something to my hairdresser. She tries to be polite about me not coloring my hair - but it's hard for her.
I'm trying to focus more on what I want and not trying to please others - or worry about what they think. I've been a people-pleaser for so long, this is a change for me. And it's refreshing!