What stops you Bud/Miller/Coors/Corona drinkers from trying craft beer?!
Some craft beers are good and some are not. It's all about preference. Many may disagree about your opinion of the beers you mentioned too. If someone wants to drink crappy beer, who cares? Let 'em. There's no reason to insult them. Only you'll know the true secret of pure beer excellence. Perhaps you can take solace in knowing that.
Beer is good. Forcing your beliefs/opinions on others is not.
I can appreciate a good craft beer (Rogue Yellow Snow is a recent fave), but sometimes you just want to hammer half a case of beers and nothing is better for that than one of the big boys. Budweiser is my "beer swillin'" choice, but if I'm serving beer at a nice meal or taking something to a beer lover for a party, I'll dole out the extra ca$$$h and buy something nicer.
Personally I love craft beer and trying new microbrews, but sometimes you just want a simple familiar Corona. Mmmm..
I just don't like the taste.