No, that won't prove the haters wrong. It will prove the haters wrong if Uber can not only IPO but not crater thereafter.
But if they spend a few weeks at $120B and then cool off to $90B, or even $60B, then I should and will eat that crow.
[1]: https://www.investopedia.com/ask/answer/12/ipo-lockup-period...
Opening weeks of an IPO is usually a frenzy until rationality returns, no?