Believe me, I won't turn down a cold major-label beer, especially if someone else is buying and driving, I just like a quality Pilsner or Dunkel better!
The nastiest beer I ever had is one that I believe isn't made anymore, it was a Schlitz Lite...I couldn't finish it, and that was after coming in from a week in the field on a tank in the Summer, and the beer was even cool, so you know how nasty it was.