Get out of the pool
When you pick your kid up from the pool and they do not want to get out, things can get messy. You do not want to take all your clothes off and jump in to get them, so you just have to talk them out of the pool as you stand by the edge.
You can look a little ridiculous trying to negotiate or threaten your kid to leave the pool with people around you. In the end, if they really do not want to listen, you will have to use a stern voice and lecture them in public. We all hate to do it, but it’s the only option left.