Smith praised his side's first-half performance at Pittodrie
Manager Walter Smith described DaMarcus Beasley's disallowed goal as "an incredible decision" after his side were held to a 1-1 draw by Aberdeen.
Beasley's injury-time strike at Pittodrie was chalked off despite the substitute being in an onside position.
"It's an incredible decision for a linesman who is in line with the play to actually give an offside on that one." Smith said.
David Weir gave Rangers an early lead but Derek Young pulled Aberdeen level.
The result ended Rangers' 100% start to the new SPL season.
Weir headed Rangers in front from a free-kick after 24 minutes but Young levelled when he smashed in a rebound on the stroke of half-time.
"Since the season started, we've been hearing that the Old Firm get all the decisions," Smith continued.
"I can sometimes handle my managerial colleagues' frustration at that aspect of it.
It's an incredible decision for a linesman who is in line with the play to actually give an offside on that one
Rangers manager Walter Smith
"It doesn't happen all the time and it's clear it doesn't happen all the time.
"We got a bad one at Tannadice earlier this season, which has been forgotten about, maybe because we don't make that much of a fuss about it - same situation here."
Smith praised his team's first-half performance but admitted the second period was far more even.
"I thought we were excellent in the first half, I thought we played really well, with good possession of the ball," he said.
Smith believes the equaliser came at a bad time and admitted: "That gave them a lift.
"I don't think there was a great deal between the teams in the second half of the game."
The Rangers boss also hinted his summer spending was at an end.
He described the signing of incoming midfielder Maurice Edu as "possibly the last" the club would make before the transfer window closes.
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