You would not. People love hearing about the things you care about as long as you can present them in interesting ways. Try it!
There’s something called “not giving a fuck” that works in those situations. The crux of it though is you need to “know thyself” or you’ll be forever your worst critic and enemy.
Also you're being open and readable to the other person. You're not being deceptive or putting on a show, which is usually what rustles people's jimmies.
Get this incel trolling out of here. No, all that would happen if your date weren’t interested in math/whatever you’re into is a polite message “I had a great time but I don’t think we have much in common” and leave it at that.
His oddly specific fear of being "plastered on a bunch of facebook new-york-dating-experience groups" sounds like women have had to warn each other about him before, and it probably wasn't about his interest in math, but something much worse.
I wouldn't go on Hinge if that's the default experience.