Please end the "we are pissed because we got rejected posts"

That may mean that your business idea/model is flawed or you simply do not have one.

It may also mean that you have a great business going but it was not a good fit for the YC portfolio.

Move on, reevaluate, talk to customers and validate your value proposition if it is a good business prove them wrong, if not pivot and keep trucking.

Maybe the next one will be a winner.