Googling isn't immediately getting me anything and I don't recall the source, but I used to read a lot of urban planning books and I recall seeing a quote from that era to the effect of "Mud! Mud everywhere!" and complaining about it. "Mud" was a euphemism for horseshit. So that was a real complaint of the time.

Though the internet did not exist at the time so I don't know if it is even possible to find quotes/resources about it online. That may be part of why he kind of speculated rather than listing a few sources of information.