To be honest, even as a chinese ultra nationalist , you should remain silent to be honest. Everyone can see that this was big humiliation for the CCP(not China). Even Chinese supporters can clearly see this, so i don't see what excuse you can give here.
As I said, Xi made a big blunder. He shouldn't have publicly declared his intention to retaliate through military means while knowing China won't do anything like that. It has just made him look weak and empty talk. It's actually a disgrace to him to be honest. He shouldn't have blown this trip out of proportion only to do nothing to Pelosi trip later. If he was my leader I will rightly criticise his policy here.