Wenger put the hostile reception down to "disappointed love".
"When he was here he didn't get this kind of reception," said Wenger. "They loved him, so today it was a bit disappointed love.
"He took his penalty very well and I knew when he decided to take the penalty that there was an 80 per cent chance that he would score because he was our penalty taker and I know well that he does that very well. He does many things very well."