norm's own autobiography is a collection of fictional stories auntie joked about literature, I see no evidence he gets particularly outraged over every novel following this standards and rigors of classic lit and this is the single offender he chooses to attack repeatedly?

I don't see how you can label the premise as even somewhat juvenile.

The premise is about women losing their civil rights in a society run by religious extremism.

gendered oppression based on religious extremism was part of the founding of a lot of countries, never stopped happening and now is happening even more, globally.

there are also books far less subtle with far more ridiculous premises that he has never commented on, although he chose this book and this author specifically to consistently sincerely lambast and insult.

The only way that makes sense as the only literary object of his unhumorous ire is that it offended something deeply personal to him, like his newly strengthened Christian sensibilities, which apparently he took seriously, even when talking to people in interviews.