What's the expression? Never trust a skinny chef?
I don't think it's a dealbreaker, I have encountered non-drinking bartenders,
but if I was hiring I wouldn't be enthusiastic about adding you to the
barstaff. A lot of it depends upon the sort of place you work. If you're
going to be a cocktail drone, just follow recipes and bang out drinks all
night, it probably doesn't matter. But if you have any oppotunity to discuss
cocktails/beer/wine with guests and to make suggestions and recommendations,
then it's a handicap. I also think it limits how good you can develop your
drinks if you don't have a thorough understanding of base spirits, liqueurs
and mixers. So much of my development as a bartender has been by developing
my palate, applying it towards making a better Margarita or Gimlet or
Manhattan. I've played and tinkered with these drinks to get them just so,
and I can do that because I'm familiar with the ingredients.
I put more sweet vermouth into a Jim Beam Manhattan than a Maker's Mark one.
Why? Because the Maker's bourbon is smoother and doesn't need as much
vermouth to mellow it out. That's not the sort of fine tuning one can do if
it's all academic. Of course that's probably more calibrating than most
bartenders would bother with, so I don't think it would keep you from getting
a job. But I would find it to be a pity to be served a cocktail by a
bartender who had little to no experience with what they're serving first
hand. Chances are you can make as good of a 7&7 as I can, but you'll always
fall behind on the more advanced stuff.
Still, there are paradoxes such as yourself out there working so don't let me
discourage you from taking a shot at getting behind the bar. Sipping could
help, but I still think it's a lot of material to learn - the flavors and
combinations out there - if you don't have several years of drinking under
your belt already. Perhaps I'm biased because I feel that my college drinking
taught me a lot about mixed drinks before I ever got behind the bar. It's
hard to know how good something is when you don't know what it's supposed to
taste like.