> you didn't pick these people, you're not marrying these people, you're working with them on a temporary basis then moving on

To be perfectly honest you're reinforcing the practise rather than arguing against it like you think. The whole point of everyone getting drunk together is to get to know the "real you". It sounds like the "real you" is quite mercenary, bitter, and reductive. No wonder you don't want to let down your carefully-crafted facade.