The thing about "beer snobbery" is it does go both ways. I find it's a rare person who drinks Guinness and has never been offered a fork with their beer, I too saw the "bitter beer face" commercials, I've gotten looked at askance for ordering non-BMC beer (no snippy comments, just ordering) in certain bars, etc. Now, I do try to avoid being a snob; don't like the industrial offerings, but I certainly enjoyed a glass of Killian's back in the day and still have a soft spot for Mickey's (which, by the way, is just about the best cooking beer ever). No sense in being a hypocrite. However, I do have a beef with BMC for actively promoting people's misconceptions about beer. I've known people who claim in all seriousness that fuller-bodied or darker ales aren't beer, and even my dad, who lives on New Belgium's doorstep and pretty much only drinks craft beer, insists that all beers are supposed to be served at a degree or two above freezing. I don't much care for the fact that I have to continually argue with people who tell me I'm doing things wrong because I don't do them like BMC do.
</soapbox>
I actually read a study done not that long ago comparing the actual caloric content of light beers to their "heavy" counterparts. Don't remember where it was so I can't link it right now, but for many of the BMC offerings, the difference was pretty insignificant; one of the major light beers actually had more calories than the "heavy" version! Ultimately, a light beer is more about having less body and cleaner flavor than calories, IMO.