The Grecians twice took the lead through 18-year-old Jamie Reid, making his full debut, but twice the struggling Londoners hit back through Luke Moore.
With Bradford denied all three points at the death by Chesterfield, the Grecians would have moved up into the play-off places but instead sit a point behind the Bantams having played a game more.
But Tisdale is adamant his side can still reach League One, especially if Reid continues that kind of goalscoring form.
"I'm not (happy with a point) because we needed a win, but I'm sure that Neal (Ardley, Dons boss) isn't happy either," he said.
"There was a huge amount of effort from the players, a total commitment from both sides and horrendous conditions. You won't see a more bumpy pitch than that one we played on.
"It was just a really hard game of football. We are still in it. We have still got a chance so I have to thank the players and the fans for a huge effort.
"I know for a fact that Jamie (Reid) wasn't expecting to be playing. Not many people in our group were until I read the side out at 1.30pm. You should have seen the look on his face when I told him!
"Jamie is a young player and I thought this was the type of game for him. He is so young but he is capable of those type of strikes."
- Sports & Recreation
- Jamie Reid