Nick Haycock was left disappointed with refereeing decisions after a last minute equaliser saved Chelsea from defeat against the young Hammers.
Nathan Ake was in the right place to fire home after Billy Clifford's shot cannoned off the cross bar and fell into his path with the last seconds of the four minutes of stoppage time reached.
Moments before, with the Hammers leading 3-2, Dylan Tombides had been wiped out in the penalty area when clean through on goal. The referee waved away appeals for a penalty and it was that decision which riled Haycock.
He told West Ham TV: "It's disappointing because in the games going back to Tottenham with the offside goal, Manchester City with the offside goal and tonight is a clear penalty to go 4-2 up.
"The disappointment for me is the Premier League talking about it being the hardest playground in the world and I'm left disappointed with the officials for a third time this season.
"It was obvious for all to see, the Chelsea player's reaction gave it away and it's lost us the game. We work diligently all week to prepare the boys to play in the Barclays Under-21 Premier League and we feel robbed tonight."
The match was a fantastic advert for Under-21 football with both teams playing their part in entertaining a big crowd who seemed to favour the boys in Claret and Blue more than the home side,
They had plenty to shout about when Pelly Ruddock put the visitors in front after 25 minutes with a right footed shot which found the bottom corner. Matthias Fanimo then doubled the lead with his first goal of the season just three minutes later.
Chelsea managed to draw level after 79 minutes but weren't on terms for long as Blair Turgott scored a brilliant long-range effort just sixty seconds later; it was a great game and one which Haycock enjoyed.
"The scoreline could have been ten all with the chances that both sides created and it was an excellent advert in what is a good league.
"It's hard for a manager to control his emotions in the dressing room after a game like that but I'm always honest with the players and they're a terrific set.
"The West Ham crowd here tonight were fantastic, it felt like a home game and I thank them for travelling out on a wet and windy night in Aldershot."
A super team performance was all the more impressive given that the side were without regulars Sebastian Lletget, George Moncur, Elliot Lee, Leo Chambers and Dan Potts.
Haycock drafted in four of Steve Potts' Under-18s and he was delighted with how the much-changed team performed.
"We made five changes but it's testament to the squad and the training group every day.
"Sam [Allardyce[ wants the best and when they go in they've got to be ready to perform at tip-top level to cement a place in his squad.
"The selection that he gave in the Capital One Cup the other night was testament to us as a Club and him as a manager in that you don't see any other teams with seven youth players starting or on the bench in the Capital One Cup."