Absolutely, You should have played more post flop. If you had him crushed like that in your stack there is no excuse for you losing the heads up battle. I mean if he continues to push every time post flop it might throw you off a little but seriously you should know, being a good player, that its more about what happens after the flop then before the flop even if you were ahead. And lets be honest you werent a strong favorite preflop, remember 4-1 still means they win 25% of the time, which honestly isnt that far behind. Even if they are at worst 10-1 preflop they still win 10% so i mean its more about luck, when u take the luck factor out of the game and watch the cards come on the flop turn and river you are playing more skill and you can play off the persons tendencies, calling him when hes bluffing
and stealing pots when you know he isn't interested. Take the luck out of the equation and take him to school. I mean if you ever watch high stakes cash games with the pros you should know you'll never see them push their KK or AA, this isn't because they are worried they are behind or wont win, its because they know there is more value to playing the hand out and seeing the cards before putting up 100K inside the pot against someone who can suck out w 25% chance or so or even a 20% chance. Its about taking the luck out of the game and playing more skill then anything. The more chips, the longer the blinds, the more post flop play, the more skill is going to be involved. It is up to you as the experienced player to dictate how the game is going to be played especially when you have so many more chips. If he continues to push preflop everytime you'll have to take a chance eventually, but more often than not the player will start to slow down knowing he cant get anywhere w that strategy, you will prevail... trust me. Gl in the future.