Hey, I am not German, but I live in Munich. I hear what you are saying, I am Italian, so try not caring about football there, it's tough - people accept it, but it makes small talk very difficult sometimes.
On alcohol and drinks in general, even at 30, I think people still care, especially the ones you meet for the first time. Simply put, not drinking alcohol may signal a bad past (alcoholism), or being a potential nut job (diet nazy or gym pumper on steroids). This is actually useful information in social interactions, so I do understand why it is so widely used. On the other end, being vegan is so much accepted and so common and fashionable right now that the signal you get out of it is rather poor, so it's used less to pre-select or to make quick judgments.