They are not stupid. That guy was either just ignorant, or basing his assessment of a whole breed on one dog he met. In fact they rank #7 on the list of the smartest breeds. If Labs were stupid, then why would they be used so often as guide dogs for the blind, bomb-sniffing dogs, etc.?

Here's the list http://www.petmedsonline.org/top-10-...the-world.html and of course, in every breed there are smart and not-so-bright dogs, but this is the generalization.