Craig Noone had set the leaders on their way but a Martin Petrov penalty that left Mackay raging was followed by a David Ngog winner.
"Do I feel hard done by? In a word yes," said Mackay. "Bolton had to come out and have a go in the second half and they got a penalty from nothing.
"David Ngog dived before he was even touched. I certainly hope the referee and the linesman look at their performances because neither of them were good enough.
"They had a goal which could have been given but the standard of officiating overall was not good enough.
"It has ultimately cost us the game and that could prove to be vital at the end of the season."