I never just drink one beer unless I have one and it wasn't tasting good to me. I will have one mixed drink a lot. I have to be in the mood to drink beer.
Admittedly, I drink for the buzz. I very rarely have a drink during the week, but when the weekends roll around and I have the opportunity I'll put down a few without hesitation.
These people sound like folks that drink Natty Lite. There's no point in drinking Natty unless you want to get drunk. People that drink just one beer typically find something a little higher up the standards scale.
I really only drink if it's to get drunk. Just having one or two doesn't sound appealing to me (unless it's a drink I thoroughly enjoy) all that much. I imagine that will change with age.