The guy didn't know the type of lenses, he admitted himself in one of the latest Q&As. Bruce effing Willis almost went full McClane on his ass because of that, as he tells it.
To be honest, I really like the guy even though he really can be a narcissistic doof who loves to talk about himself, which I guess kinda comes with the territory of becoming a millionaire by doing the thing you love but self-admittedly aren't that good at. His movies feel like their more about the characters than anything else, as much failures as they can have I've always found a certain charm about that. Plus I love hearing the guy talk about himself anyway, so I guess it's hard not like him if that IS what he does best.