I first discovered this game in 1982! I would never call myself an 'expert D&D player'. To me, that's weird... like calling yourself an 'expert Monopoly player'. I could see someone being referred to as an expert bridge player, or tennis player. There's a level of skill there that actually affects how the play develops with those games. D&D, you just play it.
All that is true. The point I was trying to make though was that this is a game. The idea that you need to achieve a level of expertise in order to be allowed to play, or at least to have your actions in game be deemed acceptable by those who have been playing longer than you... not cool.