Hairdressers who claim they know it all!

I do not like when someone tells me they have been doing hair extensions for 10+ years, yet they do not know how to apply certain hair extensions, just because they are not used to them. Such as tape ins. There are ones that you heat to apply and ones that you don't. Some hair stylist are way over their head, don't apply the hair right and then their customer complains and the stylist try to blame it on bad quality hair when infact, they were the ones who put the hair in wrong.