In my experience there are three groups of teetotalers.
There are the ones who don't drink and don't have a problem with other people drinking. The people who are genuinely in this group, you don't even notice they don't drink. Drinkers have no quarrel with this group.
The second group are very vocal about their disapproval and are constantly telling you you shouldn't drink etc. They are irritating but can be ignored.
The third group thinks they are part of group 1, but they are actually closer to group 2. They never overtly tell you anything bad, but you get the constant sense that they are looking down on you. Drinkers don't like this group because they feel like they are constantly being judged, but not in a direct way they can challenge.
The three can probably be summed up by their response to the question, "Would you like a beer?"
Group 1: "No thanks, could I have a glass of water?"
Group 2: "No thanks, I'd rather not destroy my liver."
I have to add one group to your list, people who can't drink because of health issues or use of prescription drugs to treat health issues. I've been one of these persons for over a year now.
Group 4: "I would love to but I can’t. I’ll just have a glass of water (or a near-beer) instead"
This is a disappointing line of thought. I'm firmly in group 1, but typically respond with "No thanks, I don't drink" to save myself from having to fend off drink offers for the rest of the night. For that, I am disliked....
This is just how I think about it. But then again, if you declined the first alcoholic drink then I wouldn't offer you another. You might be on medication, a teetotaler, or a recovering alcoholic for all I know, and I'm not the kind of person that needs to keep encouraging people around me to drink.
There are the ones who don't drink and don't have a problem with other people drinking. The people who are genuinely in this group, you don't even notice they don't drink. Drinkers have no quarrel with this group.
The second group are very vocal about their disapproval and are constantly telling you you shouldn't drink etc. They are irritating but can be ignored.
The third group thinks they are part of group 1, but they are actually closer to group 2. They never overtly tell you anything bad, but you get the constant sense that they are looking down on you. Drinkers don't like this group because they feel like they are constantly being judged, but not in a direct way they can challenge.
The three can probably be summed up by their response to the question, "Would you like a beer?"
Group 1: "No thanks, could I have a glass of water?"
Group 2: "No thanks, I'd rather not destroy my liver."
Group 3: "No thanks, I don't drink."