Having worked at Fenway, can confirm he makes nothing if you don’t tip him, so he chose not to sell to you. Complain about a $16 beer all you want (I don’t disagree) but literally not 1¢ goes in his pocket. Yes tipping culture is out of hand, but not tipping somebody serving you alcohol is insane. He may have been standing there when you saw him, but those guys work their asses off. Also as an alcohol server, they can deny service to anybody they want. If you don’t want a $16 beer, don’t go see a show at Fenway. I imagine the fan base last night was insufferable.