Is it okay to say "Yes you're." instead of "Yes you are."? [duplicate]
No, this is unidiomatic. "You're" always requires a subjective completion. (And to my ears, it sounds completely wrong.)
It depends what you mean by okay and proper. I have never come across it personally, but there's been at least one other question about it here. If native speakers are using it, then it clearly exists. There is no reason in principle why it should not become widely established, but that is far from being the case at the moment.