He's also full of shit. It's illegal to carry a knife in public without good reason. A court is certainly going to accept a chef going to work as a "good reason", therefore the chef won't even be arrested. The conversation with the cop might go something like...

Cop - "Do you have anything in your possession that I should know about?"
Chef - "Yes sir, I have this fine collection of knives."
Cop - "Why do you have them in public?"
Chef - "I'm going to stab up a mosque. Haha just kidding, I'm a chef on my way to work, hence my fucking uniform. Do you have good reason to carry around that taser?"
Cop - "Don't try to be clever with me."
Chef - "Sorry sir. Can I go please? I'm running late."

The cop might insist on checking out the guy's story, but he's not going to get arrested, and certainly not charged with an offence.