On-loan Crystal Palace forward Jason Banton's goal wrapped up a third straight win for the hosts and put a dent in the Grecians' automatic promotion hopes.
Tisdale said: "My first thought is that it is disappointing of course and my second thought is moving on to the next game, which we have to do.
"It's the business end of the season. It's good for me to note this game, and have opinions and an objective view and bank it for the future but what we need to do is move to the next game.
"We have got six games to go, 18 points at stake and as much as I feel miserable now, it's good for me to acknowledge that - understand why and how - and move to the next, which we have to.
"I didn't think we played well enough to win the game. Our game wasn't cohesive enough.
"We started the game well in the first 15 minutes and didn't really find that form at all for the remaining part of the game.
"So a game of little or few chances and once the first goal goes in you know it's always going to be a tough ask to come back, whichever side scored it."