Wenger made his feelings clear to fourth official Martin Atkinson and could face an FA charge after following an earlier sarcastic pat on the official's back with a weak shove on his shoulder blade.
Bruce said: "Even with all Mr Wenger's antics, you can't get away from what he's done (at Arsenal). For me, he's a genius.
"He doesn't like to get beat, but none of us do. He's never had a drink with us, but that's up to him."