I am in a similar situation, except it is pot smoking. My company has taken a liking to random urinalysis testing. I like getting high, but I need my job more. I have no problem with anyone getting high around me. Initially, I was concerned about second hand smoke, but I was assured by the pee-man (who works for some pee-handling company) that second hand exposure would not affect the test. This was confirmed when they peed me. I have not been excluded from any friends.
What Ace309 said is accurate. Many drinkers assume that non-drinkers simply would not enjoy themselves at a bar, and for many non-drinkers, he would be correct.
When I was in college, my roomate pledged a serious party fraternity. I was offered to pledge, but I knew that partying would become more work and less fun, so I declined. However, one of the pledges, a friend of mine, did not drink, smoke, or do drugs. You would not have guessed it by his appearance, he had long hair and wore heavy-metal shirts, and preferred the company of partiers.
“Why? You think the person is prudish and you think you’ll be judged by them? You think the person is “uncool” and should be avoided? You think the person will be uninterested? Or something else?”
I sense that you feel you have been excluded from events because of this. Do you wear you non-drinking like a chip on your shoulder? Do you have a “Sober and Proud of it Tee-shirt.?” Or maybe you are part of straight edge. As long as you do not make an issue about it, it will likely not be an issue.
My 2 cents, just go along. Don’t announce your drinking habits in advance. Only say it if someone challeges you. Most smart people will either figure it out or not even notice. Just quietly get a 7up instead (my 2nd favorite bar drink) and enjoy the company.
You can still get a good laugh at the drunk fratslob staggering to find a safe place to puke.