Huh? Not at all. Just be reasonable about where and when you drink. Realize that IF you drink in public you set yourself up for problems. You could be more impaired than you think, you might be in a 'shady' part of town (after all, bars, right?), you might get printed and seen with a beer, which, if cops are called is bad news, right?
I'd suggest taking off the gun, maybe even unloading, and drinking at home but not to excess.
Definitely don't drink alcohol before going shooting. You might not be drunk but still smell and if someone at the range objects you could be in trouble, "legally under the limit" or not.
Be aware that even a little alcohol consumption, followed by a righteous SD shooting can taint your evidence. After all most times people get charged they have to prove the shoot was legit. Why make this harder?
To put even a better point on it, many SD shootings are done when you are impaired - you're awoken by a BG in your room, it's dark, you don't have time to adequately size up the situation. You need all the clarity you can muster.
$.02