I guess it falls back into how I have never understood how other people can't/don't comprehend math, but I always just "got" it.

I had the same problem in AP Calculus in my senior year. The teacher would introduce a new integral solving method, and my co-conspirator classmate and I would absorb it like a sponge and be able to instantly apply it to all the new problems given to us. We'd race each other when she wrote a new problem on the board, solving it in our heads and seeing who got the answer first. Then we would work on other class homework while some other students in class would spend the next week still trying to understand the new solving method.

I had a hard time not understanding why other kids in the same exact class as me didn't understand it like I did. I guess I take that ability for granted without realizing it.