Oh, yes they are. Xi Jinping is especially stupid in the sense that he thinks he can outpower and outmaneuver USA. Building a man-made islands in the middle of the international water and pretend that they have ownership shows just how stupid the dude is.China is not as stupid as Russia, so I see very slim chances China will literally attack Taiwan, at least not physically.
If he ever attacks Taiwan, I am most certain USA will not sit idle as it is doing now amidst the Ukrainian conflict. While there's not much to gain or lose strategically from Ukraine, there is a lot to lose if Taiwan goes the way of Hongkong. Also this will tip the balance in the Far East Asia.
Finally, it's worth remembering that USA has well over 20 years of war experience. China has zero. If I were Xi, this would not be a good time to flex muscle against USA.

