Actually, I think it's bullshit that anyone would expect the hotel to not book both parties. They're in it to make MONEY. However, IF the room was not all opaque walls, the hotel should have made other arrangements for the swingers' party. If the walls were perfectly opaque, the swingers should realize that they are in a public place, which means keeping their private lives out of everyone else's life. Have a party, get naked, do whatever you want - but keep it in the room you booked, since it's not your right to decide what the kids staying at the hotel learn about life today.
But overall, not a big enough deal to be making such a huge fuss. I'm sure the kids thought it was very amusing.