He said: “It was an opportunity missed, at home. It was a poor second-half, it wasn’t what we were after. We weren’t good enough after the interval.
“It’s part of playing for Rangers. People ask about the expectations. It’s a demanding crowd because they’re used to success.
“The players have to recognise it’s an expectant crowd – and quite rightly. We have to respect that and learn from that. We know what the crowd wants, they’re magnificent.
“If we can play our game and move the ball quickly, we’ll create chances, but we fell below standards.”
Warburton made a handful of changes to the side that lost to Celtic in the Betfred League Cup semi-final at Hampden and it was the big money summer signing Garner who marked his return to the starting line-up with his second goal for the club.
He added: “It was a decent first-half. We went down to a very good goal then worked hard to get the goal back. But we weren’t brave getting out and, despite possession stats, we didn’t play the way we wanted to.
“Sunday’s game didn’t affect us. They played Sunday, too, so there are no excuses that way.
“It was an emotionally draining game, but it is part of playing for a club like this, there are no excuses.”
“It was a good start and an excellent performance,” the St Johnstone manager said. “It’s never easy coming here.
“We’re happy to take a point but we could have taken all three as we had a few good chances in the second half.
“We knew we’d stay above Rangers with a positive result.
“We’re content with the return but there are no prizes given out so we’re not going to get carried away with it.”