Skipper Derry was sent off by referee Lee Mason for fouling Young inside the box, even though the United winger had clearly been offside when he collected Wayne Rooney's through ball.
QPR director Ruben Emir Gnanalingam was livid.
Pointing to the fact Young appeared to be offside, he added: "It was offside and a dive by Young! Alex Ferguson's luck with calls continues. Just wish there was video technology!"
Rs owner Tony Fernandes replied to that tweet, saying: "Awful. Spoilt another game."
He then added: "Thank you to all the manchester united (sic) fans for their honesty. Have received 150 tweets saying he was offside and was never a penalty."