They were confused trying to follow the course of the conversation. It goes from something about Plyometrics being good for golf, then a conversation on what that first post meant. This wasn't the most conherent thread put together. Which does stem from the first post.
Besides that, i would have to agree, just because someone didn't comprehend it doesn't make it right to ridicule them about it.
As for Ploymetrics, its alot to do with moving fast. Alot of jumping, and explosive movements. I don't really recommend them for beginners. I knew a guy who blew out his ACL doing a squat jump before. So make sure to do what you think you can handle.
http://en.wikipedia.org/wiki/Plyometrics