Platinum hair - and I don't mean platinum BLONDE

As your color fades, you will probably get some funky color (anything from pink to peach to gray to who knows what) so you will probably have to keep doing it darker every once in awhile until the bleached part grows out. White hair doesn't hold color very well. The reason it turned gray is because dyes are designed with base colors that are meant to counter colors that are naturally in hair. But if you bleached your hair white, you no longer had any of those natural tones left in your hair, so any time you dye it from white you will have to be careful (and likely do it more than once with opposing base colors).

I read your post in the bloopers section, so about what you say to your stylist, well, it's still your hair. They may get annoyed with you for doing your own hair, but you have the right to do anything you want to do, so they can complain if they want, but it's your hair to do with what you wish.