RichieH, Blue Moon is actually brewed in Montreal, not high up in the Rockies. And it was originally designed and brewed at the Sandlot Brewery, the Coors brewpub at the Denver baseball park they own (a nice place that still turns out some excellent beers every season). But I suppose that's too forgiving, eh Salacious? Wouldn't want to disappoint.
This is about keeping the comfort level high: give them the beer they actually want to drink, instead of adding tension to the moment by forcing them to drink something else for political reasons. Not my idea of a "teachable moment": here, I'd like us all to get along, but you'd better drink this beer because it's better than that shit you drink.
For beer...Pete Brown's right: doesn't matter WHAT beer it is. The man invited them to get together over a beer. Not wine, and not nothing. that's great for beer.