Having something in Common

Whilst watching wife swap and its interesting ability to pitch people together with totally different social extremities noticed the bit with the inevitable boozy party. Posh family against working class "mum" and vice-versa. Once everyone has had a couple of shandies, everyone seems to make a complete twat of them selves on the same level. This also extends to weddings, funerals, birthday's etc. Does booze bring people together onto same level? Seems like it.