Terry Butcher joked that there is an informal law that his Inverness side are not awarded penalties after two claims were denied against Rangers.
"We don't get penalties - 20 games this season and not one penalty," he said after the 2-1 defeat thanks to a late Kyle Lafferty strike.
"It is an unwritten SPL rule. It is part of the constitution that Inverness don't get penalties. That's a joke.
"I thought they were legitimate, but the referee didn't think so."
A Foran header appeared to hit the arm of Nikica Jelavic in the first half and, after the break, Rangers defender Kyle Bartley appeared to pull back Caley Thistle striker Billy McKay in the box.
Butcher was angry with referee Bobby Madden at the final whistle but had calmed down by the time he came into the press room.
"I thought Bobby Madden and the officials had an excellent game," said the former Rangers defender.
"There was a problem with time, but I have spoken to the referee and he added extra time on, so I was happy with that."
Carlos Bocanegra put Rangers ahead 10 minutes after the break, but Inverness had chances to go ahead after Andrew Shinnie levelled.
"The game could have gone either way and Rangers were hanging on and wasting a bit of time at the end, which says we were doing pretty well," added Butcher.
"We conceded a poor second goal, but we missed a whole host of chances and, if you don't take them, you will pay for it, which we did."