Being a donkey from time to time

I am usually a pretty solid player and over the weekend I played in a home tounament. 25 dollar buy in, one rebuy for full amount, and 10 dollar add-on after rebuys are over. I played the rock the entire tourney. Only got my money in with the best of it. Before getting heads up, I probably only played maybe six hands and all of them were monster pots. Anyway, enough background...heads up is going well for me as I have the chip lead and I am forcing my opponent to a decision for all his chips almost every hand. Finally, I get AcKc on the small blind. I just call, hoping to get him to through his remaining chips in. He just checks. Flop comes 6h jc 2s. He puts all his money in the pot About 4000 in chips to my overwhelming 25000 plus. I immediately call (no idea why, brain fart I guess) He flips Qh 6d. The turn is a Ks. The river is a meaningless 2c. He gets pissed as I just busted him by being a donkey. Was this poor play on my part like he said? Or was I correct to call with my two overs to the board and hope to get lucky for the win?