Blaine Cook was "rejected" from Twitter after years of hard work. But he faced an insane scaling problem, and most of us would look bad if we faced the same set of problems.
Steve Jobs was "rejected" by Apple after years of hard work.
Or my all time favorite:
John Lasseter was fired from Disney because he was too enthusiastic about cutting edge digital animation (rather than the traditional animation techniques for which Disney was famous), then he became head of Pixar, which got bought by Disney, and which took over Disney's animation, and so now he is head of animation at Disney. They fired him, but now he is back, and now he is in charge, because he was right.
Lots of great people do great work and then get fired. Getting fired doesn't mean they were wrong. Sometimes it simply means they were too right, and nobody wanted to hear it.