The Light Blues failed to register their 21st win in a row after Jamie Longworth's injury-time strike salvaged a 1-1 draw for Stranraer at Ibrox on Thursday.
McCulloch, who earlier opened the scoring from the penalty spot, insists the players are focusing on making amends at Dunfermline on Monday rather than dwelling on an unlikely achievement.
"I don't think anyone in the dressing room or the management have said we would win every league game," said the midfielder.
"Has a team ever done that? I don't think so. The boys are all level-headed in there.
"We all know we weren't good enough in the last game.
"We've let the fans and management down and each individual has a chance to put it right on Monday.
"Everyone was talking about the record, but in the dressing room we were like 'now that it's gone, it's gone'.
"We're still in a very healthy league position like we set out to be at the start of the season."
Wasteful finishing prevented Rangers from killing off the game and McCulloch admits the players let their standards slip against Stranraer.
"I thought in the second half we let ourselves down," he said.
"We weren't at our best in the first half, but we got our goal.
"Usually we go on to kill the game in the second half by getting two, three or four, but the players on the pitch let the management and the fans down.
"But the positives are that at least we have got a chance to bounce back on Monday in what is quite a big game for us.
"When you play at this club you need to bounce back.
"We don't have to wait too long for the next game, so we'll be looking forward to Monday night to get a chance to put things right."