Mohsni argued with several Airdrie players and their manager, Gary Bollan, on his way off the pitch and was summoned to see Greig Aitken afterwards. He will now miss Rangers' trip to Stranraer on Sunday.
Mohsni had reacted throughout the game to challenges he felt were over-aggressive. One just before the final whistle, involving Willie McLaren, seemed to still be in his mind after the final whistle. The player had also been the subject of taunts from the Airdrie fans, although his reaction to that in the first half was to play up to them and raise his arms in a celebration gesture.
None the less, McCoist wants the player to keep his reaction to raising his game rather than his temper when opposition players and fans are in a hostile mood. "The referee said [the second yellow card] was for adopting an aggressive attitude," McCoist said. "I'm disappointed. It was probably avoidable. But he is an emotional player and an emotional guy. We will sit down in the next couple of days and have a chat.
"Whether [the atmosphere] is over the top or not, it's just something we are going to have to handle. I'm a big enough boy and have been around Scottish football long enough to know that fans and opposition are not going to open the door and let you trample all over them."
Bollan claimed to have no knowledge of why the defender reacted on his way off the pitch. "I was just trying to get my players off the pitch when he gave me an earful," said the manager. "We had to let Rangers know they were in a game with the quality they have. My players did that. I told them they had to be in their faces."
Rangers will also be without Ian Black on Sunday, the midfielder having picked up his sixth booking of the season.