US household assets are fairly well distributed between real-estate and equity markets. China for example previously had ~70% of its household wealth tied up in real-estate, which has suffered enormous declines over the past four or five years.

That said, there's no question that US households have grown fat on the massive expansion of the tech giants. A one trillion $ market cap was shocking not long ago, now you've got Apple and Nvidia at $4-$5 trillion, each about as valuable as China's top 25-30 stocks combined. The US wealth base is highly exposed to a PE multiple compression event, which is likely whenever the bubbly valuations centered around the AI boom reduce.

Also to put a reference figure on it, China's top 500 stocks are roughly worth $11.5 trillion. Nvidia + Apple are worth a combined ~$9.6 trillion.