If there is one thing I have learned, it is that people who develop a reputation for knowing a lot generally get there by trying to learn however they can. And they are generally still learning. (Just like the people you see exercising are the ones who don't need to. Same exact principle.)

So go ahead, offer the correction if you think you see one. You might or might not be correcting them for real. If you aren't, you are probably going to learn something interesting. If you are, well odds are that (if the correction was offered politely) they will be greatful.

At least if they are like me. Particularly if they are like me. I try to be a sponge. But programming is only one of the things that I have done with my life, and I have not been programming for that long. There are a lot of gaps in my knowledge, some of them big, fat and glaring. If you think you are staring at one - well you probably are!