The Scottish League One leaders face Stenhousemuir at Ochilview on Sunday after winning at Dunfermline and Airdrie in the previous six days.
The game had originally been scheduled for Saturday, December 14 but was postponed for safety reasons amid high winds.
McCoist was upset with the way the Scottish Premier League dealt with the fallout from the financial crisis at Ibrox and historical breaches of registration rules.
And he felt this latest decision from the new organisation, formed when the two leagues merged, was another blow for Rangers fans.
McCoist said: "Different initials but the same old story, the way our club has been treated.
"The game should have been played midweek. It's our fourth game in 11 days. It's just not on, absolutely not on.
"To make matters worse, there is nothing for nine days and then they are sending our fans up to Forfar on a Monday night (January 20). I just think there is something not right about that.
"They knew we weren't happy with it. We asked them beforehand. At this time of the year, when money is scarce for everybody, to ask our fans to travel for a third away game in six days. Different initials but the same old story.
"Dunfermline on Monday night, Airdrie on a Thursday night, Stenhousemuir on a Sunday. At least they have Forfar on a Monday night to look forward to.
"Our supporters, again, have not been treated well. It's just as well the Rangers supporters are a strong bunch."
McCoist revealed Stenhousemuir were happy with the decision.
"Their preferred option was Sunday, which I can understand for financial reasons I imagine, but we made it absolutely clear we wanted to play in a free midweek," he said.