Well, it's not about drinking being important to someone, it's about using that as a specific dealbreaker is really throwing the baby out with the bath water. You could be passing up on genuinely good Christian prospects on that alone.
Like dismissing someone because they are too short, or whatever superficial reason. I think this is why we so many divorces or perpetually single people that they are looking for something they'll never find. Unrealistic expectations. It's really on them if they start complaining, "I can't find a decent guy/gal", and their friends and relatives keep telling them, "You need to lighten up on that laundry list of yours, then you wouldn't be single."