West Brom defender Olsson disappointed with Arsenal's Cazorla
The Spain international is expected to dodge any formal punishment.
"I think it's a wrong decision but that said I think referees have a difficult job," said defender Olsson.
"They have to make the decision in a split second. If it's a dive, the focus should be on the person diving as well.
"You can blame the player. It's a wrong decision."