Kilmarnock manager Allan Johnston is more disappointed for Craig Slater than angry with the midfielder after his "stupid" sending off against St Mirren.
The 20-year-old had fought his way back into the team and scored in the 2-1 win only to be shown a second yellow card for his celebrations.
"We are all gutted for him as he has played an important part since he came back into the team," said Johnston.
"We told him we can't afford to have guys sent off stupidly like that."
However, Johnston has sympathy for Slater, who dived in among the travelling support after netting five minutes from the end and now misses Monday's visit of Celtic.
"Emotion genuinely was what took him off the park because he totally forgot about the rule," he said.
Slater, who had been with St Mirren earlier in his career, promised to keep his celebrations in check in future.
"I won't be making that mistake again, that's for sure," said the midfielder, who scored from the penalty spot. "It was a rush of blood and obviously stupid.
"Scoring against my old team added a bit more passion to the occasion. However, I just got carried away.
"But I just completely forgot about the booking and, after scoring, I jumped over the advertising board."
Slater realised what was coming when referee Willie Collum reached into his pocket for the red card.
"I also wasn't too sure about the rules," he admitted. "Although I jumped over one advertising board, I didn't actually go into the fans.
"But obviously now that is deemed unacceptable.
"You can bet I will remember not to do it again next time.
"After the game, the manager was just saying how stupid I was, while a few of the other boys were winding me up and saying it was the daftest thing they had seen."