But how do you know that the guy who is drunk is not an alcoholic? Because you can't know what they do behind closed doors, you have decided that the guy who is drunk is not an alcoholic. So does that give you justification to be intolerant to all people who are drunk? Intolerance = unwillingness to accept views, beliefs, or behavior that differ from one's own.
Since you disagree with the DSM-5 on alcoholism as a mental disorder, I suppose you think it is a human weakness of willpower or some nonsense as such. That an alcoholic does not suffer from a strange twisted form of thinking, an insanity, that gets them to drink alcohol in full denial of the consequences. An alcoholic does not have to drink to become insane, they get insane before hand, to start drinking again thinking it will be different this time, or worse, they simply don't care anymore.
Maybe ask yourself why you are so against a person who is an addict.