Reds caretaker manager felt the decision to dismiss Michael Chopra for a second bookable offence of diving was harsh and will appeal.
Ritchie to appeal against Chopra Red Card
Match official Mick Fletcher has already agreed to take another look at the match video.
Ritchie said: "Michael has no reputation for that sort of thing and why should he have dived in the centre of the pitch?
"I thought it was a harsh decision and the referee has agreed to look at the video to see if he got it right.
"It was a battle for us after the red card, but the lads worked really hard and we were good value for our point."
On Simon Johnson's early miss, Ritchie added: "It was just one of those things,"
"I think he was caught in two minds; whether to shoot first time or to try and go past the defender before shooting.
"Unfortunately he mis-cued his attempt and I'm sure he'll get a bit of stick from the lads. In the end I was very pleased with the effort of my players today."