DH and I are at WDW now. We've been to Epcot during F&W four days over the past couple of weeks and yes, we've enjoyed and walked around with several expensive, but budgeted for, alcoholic beverages.
My personal issue is huge, body to body, crowds so we have chosen to not only drink alcohol, but we've even done it early in the day - after all, it's five o'clock somewhere, right? We then leave World Showcase by early afternoon when crowds build and head back to the Future World side of the park. Yesterday, the last Saturday of F&W, crowds were seriously huge by about 1pm so after a quick trip around to pick up our do-over favorites we were outta there. I saw many groups of folks (I'm assuming lots of locals) who had obviously planned the day. They were in groups with many home printed (I assume) matching tshirts with lots of Disney themed drinking logos that apparently offended the OP. All were tasteful and I thought most were cute. I had investigated all aspects of touring the parks on the 'net so I already knew about this phenomenon and knew to avoid it (weekends and late nights) if I chose.
In support of the OP, I do agree that I probably wouldn't bring young children at night on weekends during F&W just as I wouldn't bring young children on a weekend night to a bar & grill type of restaurant back home that is perfectly acceptable to them early in the day. If I were offended by, or sensitive to, people drinking I wouldn't attend then either, I suppose. He and his family would probably be happier attending F&W earlier in the day or during the week. That way it works for all of us.
This is our third F&W and even in the "off season" there is plenty to drink at World Showcase. That is part of sampling the other cultures, in my opinion. People being over the top rude or obnoxious is offensive whether they are drunk or sober. I, personally, have been much more offended and irritated by people loudly swearing, screaming at their children or spouses, wearing clothing that barely covers anything, pushing/cutting/stopping in the middle of a walkway, using the flash on dark rides, and many of the other universal pet peeves. Now, if they'd just sell me a nice cold beer in the afternoon at MK
