I dislike analyzing the psychology of the chimpanzees on social media (in as much as they can be said to have a psychology), but the manic joy they're feeling is a reaction to their fear. They understand perfectly well that China is incomparably stronger than it was the last time something like this happened, so when they feel they've gotten away with doing the same thing again, it's an intense release from their fear.Now that you mention it, it is not only a measured response, it's seen as relatively feeble and weak. They won't be paying much attention. Otherwise this would've been considered an incredible escalation.
But the mania will fade and the fear will accumulate again, faster as China gets stronger. Incidentally, that fear is why you see the proliferation of Coming Collapse of China cults, the most virulent recent one being Zeihan's. It's why any minor issue China faces is blown up beyond any sane proportion. These people are very frightened.