Substitute Church had been booked for dissent while warming up in the first half and collected a second yellow card for racing to the Royals fans after flicking home Jimmy Kebe's 90th-minute cross to secure a 1-1 draw at Bristol City.
"I think the momentum of the other players took Simon into the crowd and he was unlucky to get a second caution," said McDermott.
"I didn't see what happened for the first yellow card, but it was very hard on the lad to be red carded after scoring such a great goal."
"The players gave me everything today and had Simon not been sent off I would have fancied our chances of winning the game in injury time with all 11 men."
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