It wasn't fake, it wasn't staged. In fact, Victoria, BC has a history of fans attacking wrestlers:
Victoria has always had a bad string of luck regarding incidents with wrestlers. In 2005 a fan jumped the rail and tried to attack triple H after the main event, and in 2007 a couple fans nearly got into a fistfight with Jimmy Korderas and Tony Chimmel at ringside. WWE usually comes here every 2 years to this town, but I'm guessing this incident will get reported to WWE HQ and subsequently the wait will be even longer. It is quite sad and disheartening to see fans go to such lengths to piss off the wrestlers outside of the ring. During the show, sure that's what you get for paying but not as they're trying to catch a flight to the next city. The event was overall very entertaining but unfortunately this incident caused it to end on a sour note on a personal level.
I forgot to add some details. During the pre-match promo jericho built heat by saying that he could get into the stands and "beat the living crap out of any and all of the fans", and that he disliked canada. I guess some idiot took this way to seriously and decided to try him. Shows how ignorant and foolish some wrestling fans are.