2 nights required

Trying to plan a trip to Louisiana this early spring and most parks, State & COE now seem to require a 2 night minimum on weekends. Not a major deal as we generally hunker down on weekends any way, but when on a time schedule and just need a night over and some stretching time it becomes a real pain. Tried to book a Sat & Sunday night and was told the 2 night min referred to Fri & Sat. If you take Sat, you also take Fri, and vice versa. I can't stay Fri, just want Sat & Sun. Response was "Sorry".
Things are a changing.