Steve Lomas believes there is no point in appealing Rowan Vine's weekend red card and has urged referee Crawford Allan to admit he made a mistake.
The striker was sent off following a collision with Ross County's Richard Brittain during the 2-1 win, although TV cameras failed to catch the incident.
St Johnstone won't contest the decision with the Scottish FA and Lomas believes his side have been dealt another unjust blow.
"I thought it was a poor decision, if I am being totally honest," said the Saints boss. "I understand referees have got a very tough job.
"The referee told me it was a violent bodycheck but on Sportscene he said Rowan had raised his hand.
"I don't think we're going to appeal, in fact we're not. The last time we did it was a total waste of time.
"You would like to think the referee would have a look at it. In his defence, there aren't too many pictures of it but I've seen it on our DVD and, in my opinion, it's very poor.
"I'm very disappointed. We feel we are getting the short end of the stick again like we did a few times last year. That's Gregory Tade and now Rowan. It's hard to take but we will do.
"We'd just like to see a bit of common sense. If you're wrong, admit you're wrong. That's my job, I've got to do that.
"I've got to hold my hands up and say I am wrong. So we're very disappointed with the whole situation."
Lomas admitted he had little faith in the Scottish FA's judicial system, saying of the last appeal he attended: "The last one I went to was totally farcical."
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