As already stated, but perhaps not quite this way...
This is one of those areas of life where you are simply not in control of what happens as a result of your actions. It is an unfortunate but true part of life that sometimes we are unjustly judged, and there is nothing we can do about it.
There are at least three categories of people who might observe you drinking while carrying a firearm:
1. Those who are our "friends" who fully understand that it is possible and even normal to have a couple of drinks and still be a responsible, law-abiding citizen.
2. Those who are neutral, and uninformed about any aspects of the issue. These folks will observe and simply not know what the situation is, whether it's legal or not, whether you are a threat, whether it's perfectly fine. These opinions will be based on their lifetime of experiences, and will have nothing to do with you, your character, your training, your personality or your ability to safely drink.
3. Those who are most definitely NOT our friends. These are the folks who would use ANY information to their advantage to hurt our cause. They may know full well that you are breaking no laws, and that you are not a threat to them or anyone else, but the only thing that counts in this world is appearances.
One additional thing to think about, an observer of your actions is not necessarily there for the entire time you are. They are going to take only two facts, that you are carrying a firearm, and that you are drinking. The time you are there, and the rate or even amount of consumption are not a part of their reaction, just those first two facts, which are all they need to do much damage.
If a law enforcement officer is called, your position is quite weak, because the facts are already well established that you are carrying a firearm, and you have been drinking. Every sentence you start with the LEO will begin with, "Yes, but..." This is not a good position from which to negotiate.
There is basically no way to come out a winner in this scenario, because you never know who is watching, and what their agenda may be. It's a question each person must answer for them self, but is that one or two drinks really worth the risk?
TFred