No need to justify or apologise to anyone with regards the choices that you make. If you want to have a few drinks at the game, with whatever intentions, that's up to you. If you don't, likewise.
I used to drive to games solo for a number of years, and so I wouldn't drink in and around the game at all. In recent years I've been going with mates and having a few drinks pre and occasionally post match, and sometimes that results in me being in the kind of state that would make Rob look sober but y'know what, I've mostly enjoyed myself in doing so. These are very contrasting match-going experiences, both with their positives and negatives. There is no right or wrong way to do it.