oh, heh, I just remembered--while I was at the store I think I got my first attempted green-hair dis, from an older shopper.
them: your hair is very... striking!
me: thank you!
them: did you--intend for it to be that color?
me: oh, yes--although it's faded out a bit, I need to darken the green up some.
them: oh... oookay...
me: thanks! /cheery wave /wanders away
it didn't occur to me until afterwards that they were possibly trying to be rude/disapproving. XD