Things got weird fast when a man generously allowed his Karen neighbor and her kids to use his pool. At first, it was no big deal—she would ask, and he didn’t mind. But things took a turn when she started showing up unannounced, even using the pool when he wasn’t home. The final straw came when he returned from work one day to find Karen throwing a full-blown pool party with her friends, complete with floaties, snacks, and loud music. He confronted her, explaining that she couldn’t just use his…