Personally, I think that bashing/penalizing ignorance (and I mean the word ignorance literally, as being uninformed about a topic, no offense here whatsoever) is one of the lowest forms of abuse. It says much more about the downvoter than it does about the downvoted. And this not even considering the fact that searching online for "m_" isn't going to help you answer your own question.
If everybody just downvoted the questions they deem unworthy of an answer because "you are supposed to know this", there would be no questions answered.
Sorry for the OT.
Because complaining about coding conventions on a discussion about a design pattern is noise and adds nothing to the discussion.
And judging by other comments to the question, I wasn't alone, luckily.