Young was booked for diving before winning a dubious penalty that also saw Palace defender Kagisho Dikgacoi sent off at the weekend.
Parish told BBC Radio 5 Live: "I think the referee was very brave on Saturday. He made some big calls. Giving a yellow card to a player at Old Trafford for diving is a massive call.
"Sometimes the so-called leg breaking tackle can be in the heat of the moment. It's not intended and yet you get a straight red for it. There's a certain cynicism to diving in the penalty area which is surely worse because there's an element that's so premeditated in trying to con the referee.
"Personally, I think these things are worse than a full blooded challenge that is not intended to hurt somebody but is just a competitive challenge in the spur of the moment."
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