Glenn feels the second half performance warranted a win, but says missed opportunities were key to not sealing the three points.
"We worked extremely hard in the second half to get ourselves into the lead and I think the key to the game is the chances we had at 1-0," reflected Glenn. "That's where we could have won the game and tied it up.
"We were a bit tentative in the first half and didn't have any cohesion to our game.
"I said to them at half-time we've got to wipe the slate clean. If I was the West Ham manager I'd be worried because they had plenty of possession but didn't score.
"We came out of the traps quick, Steffen Iversen did well for us, gave us good movement, got a terrific shot off and Teddy's there for the rebound and you think 'here we go'.
"We then had two good chances to finish them off so it's very frustrating for us again, especially to let the goal in so late.
"It was a wonderful strike, but it's to no avail if we had taken our chances and taken control of the game. It's a very, very disappointing feeling again."
Glenn rejected the post-match suggestion that tiredness or a concentration slip had allowed West Ham to nick a point.
"With a strike like that!
"We had a chance to clear it from Ben Thatcher and a chance to clear it from Simon Davies. Ironically, they were two lads who played so well. I felt a few of our lads played well over 90 minutes, but I felt the whole team played well in the second half.
"We did enough to win the game and I felt we should have won the game.
"We have been punished for poor clearances but, I had Pearcey at Chelsea and he's never hit a left footer like that - and I don't think he will in the future.
"A few weeks back against Everton Weir hit a similar sort of goal against us. We want to get out of that habit, centre-halves hitting strikes like that."
Glenn Hoddle rued the missing of second half chances after a thunderous Ian Pearce effort saved a point for West Ham on Saturday at the Lane.