Ok, the reality is, US bases have been hit by Iranian ballistic missiles, US soldiers have been arrested in international waters by Iran, and US diplomats were taken hostage. All are acts of war yet US did nothing and US citizens just seethe for a while then forgot about it. This is despite US threatening to destroy Iran multiple times.
You can bet that if Chinese military bases were hit by foreign ballistic missiles China wouldn't just let it go. Korean War is one example, 1962 against India is another. China has already proved it can and will wage expeditionary war in response to provocation. I don't know why that's even in question.