As someone who used to hang out in a few language channels on freenode, I completely understand why the lectures exist. You may have a good reason for asking the question you're asking, but the overwhelming majority of the time when a nick I don't recognize asks an esoteric question about low level optimization, it's because they are new to the language (and often programming in general), and have gone far down a rabbit hole they don't need to go down before asking for help.

When I tried to answer these kinds of questions, I always tried to start by asking questions to make sure I did fully understand the use case and the application. In my experience, a large percentage of people, regardless of how valid their question is, refused to give enough detail to allow me to actually understand their specific use case.

After repeating that cycle several times a week for a few years, it becomes very temping to just shut down the weird esoteric crap with a canned response that might get newbies pointed in the right direction. A small handful of people will stick around to explain why they really do understand their problem and need an answer to the question they are asking. A small handful of newbies will take the advice of the canned response and learn from it. The rest were largely not going to lead to an interesting conversation no matter what.