So I know I probably am BU but I'm in a bit of a grump about this so wanted to have a rant.
I'm not teetotal but I have periods of time (weeks or months) when I don't drink alcohol for all kinds of reasons.
It annoys me that during these periods there's always a moment of silence in the pub or at a meal where there's a clear expectation that I explain why I'm not drinking.
For example, yesterday I went to the pub with some colleagues and I ordered a Coke. One colleague said "Oh, are you driving?" to which I said I wasn't. Another colleague said "Oh you're not drinking" and I said "No, I'm not". After both of these moments there was a really awkward pause where it was clear these colleagues were expecting me to explain why I wasn't drinking. I didn't explain, mostly because there is no particular reason or explanation and, secondly, it's no-one's bloody business 
It really annoys me. Alcohol is a drug and is addictive yet is so normalised in everyday life that there's an onus on people who don't drink to explain why not. It's really bizarre and I can't think of another instance where people have to explain why they don't do something harmful in everyday, normal life.
I don't know what my AIBU is - I just wanted to rant !
I guess, AIBU to just let the silence hang and not offer any explanation as to why I'm not drinking?