The problem is that it's a good book by someone who went off the deep end. If you read the book, it's not alt-right nor is it hateful. It's very sensible and very reasonable to appreciate.
"What's one thing that you could do, that you would do, to make tomorrow a little better?"
Lessons like that are important especially for young people trying to get some direction and momentum in life.
For all I know, they like JP through and through and it's not worth it. To be honest I wouldn't answer with that book without adding some kind of caveat, but I also don't want to feel like I'm backpedaling on the very first message so would probably answer differently even if that was the answer that came to my mind.
Let's suspend disbelief for a minute and assume that the Tinder match doesn't know that Jordan Peterson is an alt-right lunatic and that 12 Rules for Life is decent advice that everyone would benefit from. This is still a bad answer. If you think of all the books in the world and the one you come up with to introduce yourself is this, you have all the depth of a salt pan.