Rook, King & Kinght, vs Rook & KIng, A Draw????

It is a draw, but the side with the knight should of course try to win. Your opponent gave you a draw too early

in bullet that is true, but it daily they have all the time in the world (well almost), and mistake is less likely

It's a draw if you are accurate but he could have tortured you for the full 50 moves and another 3 months so happy days!

It isn't possible to force a win, but it's possible to lose. Famously Kasparov won against J Polgar, and Jobava won it recently against a strong player. Use http://k4it.de/index.php?topic=egtb&lang=en to check any position <= 6 pieces. Pinning the knight as you did is usually a strong defense.
Just wondering if it is possible (if your opponent doesn't make a mistake) to force a mate with a rook, king and knight vs a rook and king.....never came up in any of my games in 10 years before without at least an pawn somewhere. This is the end position of the game I refer to, he was nice and gave me a draw, neither of us could see a forced mate: https://www.chess.com/daily/game/152199388?page=1
It was actually a 960 game, but doesn't really make a difference