Why are such statements as "no one can tell me what to believe (or what to do)" doesn't work as a response to moral criticism?

and why it isn't a very respectable or sophisticated response to differences in opinion?

Because Moral Criticism is a critique literary, judges the value of the literature based on its moral lessons or ethical. And this way to answer does not have anything to do with a moral way to answer.

This way to answer is kind rude, even if you have a different opinion everybody has the right to have their own, so you can not simply reject in a rude way even if you do not agree, be understanding and respectful with others opinions shows a mature person.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

answer; delirium is a common adverse reaction seen when elderly patients take diphenhydramine;