Microbrew hate from Macro lovers?

Let me start by saying that I fit into the "beer snob" category. I enjoy porters and imperial stouts, Belgian strong ales and barley wines. I might spend $10-25 on a single bottle. Hell, I've even got a lengthy beer journal. But, I don't see a single reason not to enjoy something like a cheap Budweiser with my friends, or by myself after a long day at work. You can't always afford to drink the expensive microbrews, and frankly some of the mass produced ones aren't that bad. I feel like there's a time and a place for each.

However, I think everyone has to admit that the quality of the mass produced beers is not up to par with the micros. MGD64 for example is not beer. It's beer flavored water. Same goes for Coors or Keystone, or many of the other varieties that are heavy on the rice, and low on hops and flavor. Compare a simple rice and malt formula, with one that has toffee, vanilla, cocoa nibs, and espresso with three kinds of hops and aged with oak wood chips. I even know some brewers who toss in a whole chocolate cake, or a pizza with all the toppings into their mix! There's simply no contest, and although not everyone will like the taste of these complex beers, the quality and personal care is indisputable.

So why do I see so many people in beer questions on Yahoo saying things like "don't trust the microbreweries", "they're still learning the art of brewing", or "they're piss water"? I know that people from the macrobreweries spam the rating boards on Ratebeer and Beer Advocate. Are they doing the same on Yahoo every time they bash the microbrews as one single category and praise Coors, Miller, and the rest of the macros, or do some people genuinely think that ALL microbrews are pure garbage?