Even now, with retail being the most powerful they've ever been in human history, they might be able to squeeze a single, small or mid cap equity (GME being the most famous example) but they cannot move sectors of markets, much less create a generalized bubble in ANY asset class.

Crypto 2017 is the only "bubble" which you might claim was retail-driven (even then, you'd need to provide evidence for such a claim), and even that had institutional money such as Grayscale, high-net-worth speculators, and algotrading from high-net-worth speculators driving the bubble. Not to mention that was a tiny bubble relative to any equity market bubbles.

It's well-known Tech bubble 2001 was driven by investment banks. It's even more well known that the 2008 bubble was driven by investment banks, hedge funds, and derivatives trading. The current $2.5T+ market cap crypto bubble has been formed by large institutional buyers, high net worth individuals, and corporations pumping money.

Dutch Tulips, South Sea Trading Company stocks, 90s Japan were all from institutions or high-net-worth individuals (nobles, royalty, corporations, etc) as well. Your post really couldn't be further away from reality. The historic bond bubbles have all been inflated by institutions and governments. Making a claim that even one bubble, much less "most" bubbles are caused by retail, is an outrageous claim which requires extraordinary evidence that you would need to provide.