If Zidane wanted to get back at the guy then he should have kept his cool and been in the PK challenge. It's that simple. I'm sure it's not the first time Zidane had heard such things. When I played, the keepers and defender constantly hit me and tried to break my concentration with insults.. which I always replied with a score or hard play.
Zidane was one of the greats. He should have acted that way.