Your Pinterest board might have been perfect and your reference photo perfectly clear. You even turned your phone screen up to maximum brightness and held it directly in front of their face to remove all possible ambiguity. You said the words slowly. You used hand gestures. And somehow, somehow, you left having to cancel all your plans for the next 4-6 weeks.
Hair salon fails hit different because hair is not furniture. You cannot return it. You cannot cover it with a throw pillow. It just lives there, on your head, in public, every single day, while you wait for time to fix what scissors destroyed. These poor people know the feeling intimately. Welcome to the support group.