It's not shaming...just having some fun. Not to mention that a quick search would yield several similar threads. Lighten up or scroll past...it's a rather simple choice.
As long as it’s stated up front, people can choose whether to participate or pass. Probably not a bad idea for the organizer to have some ‘proof’ in writing to avoid the thirsty ambulance chaser from ruining the party should the opportunity arise.
IMO, cruising Carnival compares to going to Walmart. Walmart has a lot of items that fill a need, and generally at a reasonable price point...but not where we always want to hang out, and certainly not the only place to shop.