It's perfectly permissible to post pictures of yourself drinking. Particularly because I am nineteen years of age and am free to do so in real life legally. That certainly isn't against the law and neither is posting pictures of myself legally drinking while on holiday.
Andy wasn't fired for just pointless posting. I cannot divulge the reason but I have given him the opportunity to post the dismissal PM if he chooses to do so. Obviously he has chose not to, which indicates to me that he is unwilling to do so because he realises that he was not in fact dismissed for the reasons heh is claiming.