One of the many reasons this is a bad idea hasn't been mentioned yet, I think: If you are a well-meaning, eager-to-learn, but woefully ignorant coder, you probably don't know enough to know which questions are stupid. After the first time or two that someone humiliates you for asking stupid questions, you don't just stop asking stupid questions, you stop asking questions entirely.

I've been this guy. There was a good long while when I would just bob my head through stuff that I didn't understand at all because I was afraid of being humiliated in public, and then go back to my desk and spend hours trying to figure out what I was supposed to be doing. I was lucky enough, a few years back, to run into a very understanding mentor who put some effort into deprogramming me and making it clear that it was okay to ask stupid questions.

Making people feel small for being ignorant isn't just rude, it actively destroys productivity.