Within some families, going out drinking includes some level of making a spectacle of oneself. Many of these families are concentrated in the greater Boston area.
Guess they see plenty of tourists come through here, I deduce from the noticeable absence of hard stares a city slicker like me can expect to draw in a one bar town such as this. Either that, or they are just really into the music. And to be fair, song and booze have an age-old partnership.