not every straight edge kid (or grown up ) goes out and tells everyone. i know many straight edge people, but no one of them labels himself everywhere everytime. they just "are".
Aye, I'm personally sick of having to explain to everyone why I don't drink, usually brought up by the fact I'm out, can walk straight and don't have a drink in my hand. For gods sake, why is that something that NEEDS to be explained?
No-one asks why I don't smoke, or don't do drugs, its ALWAYS with the damn drink.
Then again I guess living in the UK, if you don't drink you aren't patriotic or something