Palmer's official website describes his namesake drink as iced tea mixed with lemonade and points to the ESPN commercial as part of its popularity. The pleasure of the clip is seeing the person whose name became the order perform an ordinary little task.
That is a good format for a clubhouse interlude: short enough to watch together, recognizable enough to start a conversation. It also gives the collection a place for the golfer who wants tea and lemonade without making an alcoholic drink the default social ticket.
The order is part of the round
Christopher Powers' September 10 Golf Digest column begins with a reader's pace-of-play complaint. Courses encourage purchases from the beverage cart, but elaborate orders and payment can hold a group in place. Powers uses transfusions and water hazards as examples in an openly personal argument about saving some drinks for afterward.
His column is opinion, not a measured study of beverage-cart delays or a rule governing what golfers may order. Golf Digest's original post links to the full piece.