"We are massively disappointed," said Curbishley. "We felt we dropped two points and while it wasn't spectacular we had enough chances to have won the game.
"We got ourselves in good positions to have got the second goal. Reading kept going and when you see their goal again it is a shocking piece of defending from us.
"We keep setting our fans up by winning away from home and then coming back here and not doing it, but it is not for the want of trying."
The Hammers were booed off at full-time, but Curbishley remains happy with his side's points haul at this stage of the season.
He added: "The fans are as frustrated as me. We are all frustrated.
"You expect to win your home games. We have drawn with Bolton in the 93rd minute. We have drawn again today. We have drawn with Wigan.
"They are games you have to get the three points from and turn this place into somewhere teams don't want to come.
"But the players are giving their all. During this season I have asked players to play out of position and they have given their lot.
"We are on 26 points and I'll take that."