Oooooh I am so touchy about hairdressers, I've never managed to be loyal to an individual but I've ditched salons over bad hairdressers many, many times.
I have flat, straight, fine, thin hair which is the absolute pits, and to be honest I resent paying to have it cut, but a good hairdresser who makes me feel good is money well spent in my opinion. When they look at my boring, horrible hair and just think "yawn, that'll take me five seconds, easy money" and make no effort then pocket £50 for the pleasure it makes me furious, especially when I leave looking considerably worse than I do when I style t myself at home. I've boycotted salons I previously liked over:
The woman who read my magazine over my shoulder while giving me a flat, lacklustre blowdry which I wouldn't ordinarily have left the house with, and dithered like a rabbit in headlights when I asked for a fringey bit lond enough to be be curled
(Another hairdresser in the same salon made me feel like a princess. I'd go back for him, but I've been too busy bearing a grudge.)
The guy who was so bored he practically did my hair with his eyes shut, and didn't offer me so much as a glass of water, even when I pointedly asked him to stop so I could get a drink out of my own handbag. Had previously been plied with wine and been made late for a dinner appointment as I was being treated to such an incredible blowdry effort. (That guy had left, so I got stuck with Mr Bored and never went back.)
The woman who told me how lucky I was that my stylist hadn't come in that day so I was getting a Super Duper Director person for the same price. I didn't feel bloody lucky when they kept changing who was doing my hair every few minutes, getting the girl who swept the floors to wave a hairdryer at it for ages to disguise the fact that they were too busy for me, and put all my hair over my face like Cousin It and fucked off and left me like that for ages 
The guy who was actually really good but smoked some kind of insane Eastern European cigarettes which smelt stronger than cigars. The smell made me gag, and I am partial to a Marlboro Menthol in a beer garden!
Sorry OP, I'm sure none of this is helpful to you, just using the opportunity to offload 