Why do you think you would look like a "party pooper" if you aren't drinking beer?
Especially given that you don't really drink, WHY would you feel the need to drink just because others are?
I will tell you, if your friends get on your case about drinking, it's time to reevaluate those relationships. My husband almost never drinks, and the day ONE friend might say something about that would be the day he had a long talk with that friend. His choices don't have anything to do with their choices, and they need to realize that.
If you don't WANT to drink, don't. If you WANT to have a light beer, have one. (if you don't normally have them, expect to not like it much) If you WANT to have a non-light beer and you have the points for it, do it. Do what you WANT to do, not what you feel is expected. Drink a ton of water along with the beer.
If it causes a gain the next morning, it causes a gain. You know why, so don't let it throw you mentally.
This is how I feel on a weekly basis hearing my fellow meeting members talk about what they eat. They have a whole different relationship with foods than I do, and a very different relationship with their points! My former deprivation-on-WW plans have not worked for me in the long run, and I have no interest in starting over again (unless it was a post-baby startover...that I would welcome and relish).
. So far so good today. Actually started back walking 
and racked up a few miles - I'm doing the challenge (see my signature below) - please join us!! 
