TMZ reports that Feldmen felt Haim's absence from the ceremony's 'In Memoriam' segment displayed the Academy's ignorance and shows that they "don't have a handle on who the public adores".
"Corey's films have earned the industry over a half a billion dollars and his work remains an inspiration to young artists worldwide," Feldman told the website.
"Corey dedicated his life to the film industry. The same industry that failed to dedicate even 30 seconds to his memory."
The Academy responded to Feldman's complaint later on Monday, saying: "Whatever the length of the sequence, there will always be fans and family members of those not included who will be disappointed by their omission.
"The Academy extends its understanding and its apologies to those who missed seeing a favourite face in this year's feature."
Haim died in March 2010 at the age of 38.
Feldman previously expressed his disappointment with the Screen Actors Guild Awards for also failing to acknowledge Haim's death.