When I initially read the thread title, I thought that this thread might be about dating somebody that you normally wouldn't date due to attractiveness, etc. (..i.e...cool jock with a nerdy bookworm).
After reading further and realizing that this thread is about a difference in behavior/habits, my perspective becomes a bit skewed. My ex was a big drinker and loved to party. My personality is more laid back, observant and I don't consume alcohol. Our personalities clashed quite a bit because of her desire to drink and party (..which usually led to fights with other women or men, obnoxious/beligerent behavior, aggressiveness towards me, etc.). Only you will be able to determine if your differences are detrimental to the fabric of your relationship.