YSK that if you’re out with people and don’t want to drink for any reason; having a non-alcoholic drink (anything really) in your hand can help you feel at ease and signal others you don’t need a drink.
from /r/YouShouldKnow
YSK认为，如果你和人们在一起，并且因为任何原因不想喝酒；手里拿着不含酒精的饮料（真的是任何东西）可以帮助你感到安心，并向其他人发出你不需要喝酒的信号。