I fly a fair amount on business-traveler routes and often in the smaller
cabins and shorter flights am the only one to order a drink. Most of the
time the FAs are perfectly fine with that. Only a few times, on US Air,
have I felt that I've been served by a disapproving teetotaller. Even
on Delta to/from Salt Lake the wine kept flowing happily. And, yes,
often on United the glass gets magically refilled time after time (if it's
wine; for spirits they ask first).