I recall the same “irrational exuberance” during the tech bubble.
“government money is just buying government debt”... swell LOL
No you didn't. Sir Alan made that stupid “irrational exuberance” gaffe way back in the mid-90's and the markets appropriately ignored him for years. Much later at the end of the decade when there really was a bubble threat he was (as usual) oblivious and was busy crusading against (you guessed it) Y2K!
Greenspan is an idiot. No way around it.