> what is the psychological label for people who do not distinguish artist from art?

There isn't one because you can dislike a person and/or their works for literally any reason you want.

Is there a label for insisting that people put aside their feelings and engage with something because you have deemed their reason for not doing so invalid?

I said nothing about like or dislike.

I only implied that implied psychological traits of a fictional character are not evidence of the same psychological traits in the author. It's merely evidence that the author is capable of observing or imagining such traits in others.

‘Shoulding’?

while I agree that an artist can not be separated from his art (forget Poe, see Vrubel), there is also a label for people that put their faintest feelings above everyone else, and that label is: a despised snowflake.