Quote:
- Not everyone is entitled to my opinion.
Brilliant wordplay there. I'm jealous and going to steal that quote.
As for the OP-- your fiance isn't going to change his behavior, he's signaled as much by not working with you when you brought up the issue. Instead he doubled down by calling his mother to validate his initial assessment (very child like imo, but beside the point). Unless you can find a compromise or some mutual understanding this issue will continue in perpetuity.
One suggestion-- you mentioned researching his interests. If you've come to a mastery of those interests and drone on endlessly about them (as aspies are prone), he may view that as threatening. Those are HIS interests and if you display mastery on par with his own or superior than his own it WILL cut into his sense of masculinity. Likewise, don't expect him to endlessly research subjects near and dear to your heart-- neurotypicals for the most part aren't wired to be obsessive about such things.