Do you mention this to disagree with the claim that the LLMs have been built to please their operator? If you do, I see no conflict between the claim that an LLM has been designed to please its operator and the claim that operators of LLMs tend to be absolute dogshit at considering statements from humans that conflict with claims made by that operator's LLM.
To rephrase my previous paragraph: It seems likely to me that an operator that has their ego repeatedly stroked by the output of the LLM they're using [0] will react very defensively when a human tells them things that disagree with the output of that LLM. "How dare you disagree with this thing that seems very human to me and consistently tells me things that I like!? Don't you understand how much I trust it because of how pleased it has made me?", yanno?
[0] ...thus, being very pleased by said output...