It's the APPEARANCE of evil if you're sitting there with a bottle in your hand.
If drinking wine were forbiden in scripture, you might be right, but it's not...It's described as a blessing from God...even "aged wine" and "strong drink."
Deuteronomy 14:26 - And spend the money for whatever you desire—oxen or sheep or wine or strong drink, whatever your appetite craves. And you shall eat there before the Lord your God and rejoice, you and your household.
We must stick with scripture. It is not helpful to call something a sin that God doesn't call a sin, but in fact encourages and says is a blessing from Him.
Would we tell the homosexual "I'm gonna do this once and it's okay but you're doing it to the extreme and again and again"?
Well, homosexual acts ARE called a sin, so it's a different issue altogether.
Also, if you are drinking beer ONLY to try to fit in with your unsaved friends...that is not a good reason to do it...I know from 2 years in Boston that it is perfectly fine to say "no thanks" when offered beer...I never had anyone question me about it ONCE.
If you wouldn't openly sit on the front pew of the church and do the same thing in front of everybody, ask yourself why not?
Actually many churches DO walk to the front of the church to partake in real wine at communion...