My experience is that I am NEVER acknowledged when flying F and maybe, just maybe 50% of the time in coach. There was a brief period where I was acknowledged as a MM but that is long gone. And I usually have to let them know that I am entitled to a free meal in Y as a MM. Makes me feel awkward and I don't like it. In fact, I even check the website now before flyday to be sure that perk hasn't been taken away because I don't want to make a fool of myself when I ask for a free meal.