There is a time and place for both. Wine and beer can both be delicious and terrible. I have had delicious home brewed beers, I have not had delicious homemade wine, or even anything close to as good as I can purchase. I think the main thing is that home brewers can get the same ingredients that commercial brewers use, with home made wine the fruit quality is much lower. Also most truly great wines are blends of fruit from different areas within a vineyard or appellations(sp) and/or different grapes. The long and short of it is that most wines are made from tasting dozens of post fermentation wine and blending the "winners" together to achieve different results to arrive at what the wine maker wants. The best wineries will even sell off the "reject" wine and keep only the 25% or less that they want for that years blend.
Id say if your friend drinks his own wine(which is likely schwill compared to what he could buy) he really isnt very into wine.
I love me an IPA all day every day and think its one of the pinnacles of mans beverage creation but for my last meal I'm eating steak and pasta(different courses) with a magnum of in your face red wine.