As an immigrant from deep inside the Vodka belt (Russia), it's not a class thing. Over there this is just how you hang out with friends, whether you like it or not. Not drinking vodka invites ridicule and jokes about you being in poor health (the only acceptable excuse to not drink vodka). Moreover, if you're a businessman, your business will often require you to get blackout drunk with partners. Like it or not, nobody gives a shit. "We drank vodka together" carries the same weight as "we broke bread together" might elsewhere as far as closeness, trust, and friendship is concerned.
Here in the US I haven't had vodka in years. The US right now has such great beer that drinking any other alcoholic beverage should be illegal. Possibly the very best anywhere in the world. Not even Germany/Austria/England come anywhere close to what you can buy on the US West Coast.
Even in Russia though the attitudes are changing. Anecdotally, meeting with my university friends a year ago we drank only beer, and they said they mostly drink wine (beer in Russia is pretty bad still, although the situation is improving).