well
i had a lesson with a new teacher since my last one left to study in england.
she said my playing is so bad that i should start studying piano over again!:(
she still thinks i have a good talent for it.
but now she wants me to play "june" from seasons by tchaikovsky
and she says my musicality is near zero or zero 
You don't have to start over per se. you can still play whatever you like away from her and the practise she wants you to do.
...and obviously you can't really start over, until that device from Men In Black is invented.
But, I'd say there's a chance she's right, for the simple reason that you don't know if your playing is good or not. Perhaps after a few lessons with her you'll hear the difference in your own playing [and show us with the next zip file you post here]
A lot is missing without context. I read her words in an objective way it could have been very constructive. Someone people see what she has said as demoralising, but as a piano teacher talking about your playing in a teaching situation she's in context to be honest, frank and say what is wrong with it in objective terms.
Someone saying your playing is good when it isn't is far worse. I'm constantly annoyed at people saying my playing is good for a few reasons (a) It shows, if they are knowledgable they are dishonest - and whatever reason they've chosen to be dishonest "your feelings" or whatever, they aren't helping me get better.
(b) The alternative. They really do think I'm good and that just says they are clueless about what is good and what isn't and thus they aren't able to help either by judging a piece you've been practising. Worse case, in their mind you'd been playing fur elise [or whatever] for a week, they haven't realised that on monday you couldn't play it and on Friday you could, they can't hear any difference.
Lastly, because the fact they can't tell the difference between Horowitz and me is really saying 'No big deal' to us both for the effort we put into it. It's a bit like some here giving constantly diminishing time to get from zero to hero "3 to 5 years" one week, then it's "1 to 3 years" as obviously piano playing has a more favourable exchange rate or something.
Then "Learn 4 pieces in month? You could learn 400 pieces IN YOUR SLEEP! You don't even need a piano. Or arms!" We all know it's bollocks, but what it is really saying is that being able to play is no big deal. If you can do it, well, you didn't have to do much. Whatever you do next week, "well you could already play the piano so..."
If Chang had read his book instead of writing it, and gone to bed then he'd be a pianist, he just doesn't want to be one, preferring to put the effort into writing so we can

If she were laughing doing "yo playing so bad..." jokes like those fat jokes then yeah, walk away, but if she was objective, I'd take the lessons and her advice for what it is - probably good for your playing.