As a beer snob, I've had this discussion with people several times. I'm of the notion that beer should be drank straight from the bottle. Drinking from a glass changes the oxygenation of the beer when it enters the mouth, thereby changing the flavor. Plus, depending on how reputable the establishment where you are drinking the aforementioned beer in a glass, the ratio of beer to carbonation changes slightly or greatly, which affects the flavor.
How do you prefer your beer?
How do you prefer your beer?