I’m not so sure. Excluding microbrews and “exotic” varieties (IPAs, stouts, etc.), all mass-market commercial lager beers are pretty much the same. They use the same ingredients, the same process, and end up with pretty much the same thing, which provides a “crisp, clean, refreshing taste” (or some variant on that theme).
So, the only way that they can differentiate themselves, is through marketing to different demographics. Drink Coors, and imagine yourself as one who enjoys the outdoors; who enjoys fresh mountain air and can appreciate Rocky Mountain water. Budweiser is a slice of Norman Rockwell Americana, with its famous Clydesdales pulling a beer-wagon. Miller is for the hard-working blue-collar folks, who enjoy “Miller Time” after their shift is done for the day.
We’ve seen so-called “lifestyle” advertising for beer in Canada for years. Molson Export Ale was for men in their 30s and 40s: Jake and the boys on the golf course, or Bill and the guys fixing up a classic car. Women didn’t drink Export; it was for men, obviously, and so they (and many men in their 20s) preferred Labatt Blue or Molson Canadian, whose commercials showed a group of mixed twenty/thirty-somethings having a picnic, maybe with a little friendly game of frisbee or touch football thrown in. Carling Black Label came back from the dead in the early 1990s, by advertising specifically to young professionals who were likely to hit the clubs on the weekend, and assorted hipsters. Nobody in Canada’s Coors Light commercials, no matter what they’re doing, looks older than 25–it’s obviously not for married people in their 40s. And so on, and so on.
I’m generalizing, and there are exceptions, and my examples may be a little dated. But I think they illustrate my point: brewers pick a brand, and target it to a demographic. Maybe older, maybe younger, maybe cross-generational, but with something in common. People who identify with the demographic being advertised to, drink that beer.