A Reddit user has expressed frustration over a neighbor's habit of leaving passive-aggressive notes every time they use their dishwasher after 9 PM. The original poster clarified that their building has no specified quiet hours and that their dishwasher is relatively quiet. Despite this, the neighbor has taken issue with the time, leaving notes such as '9:40 PM is late' and even documenting the exact times the dishwasher is run. This has prompted the user to consider leaving their own notes in response. The situation has sparked a discussion about noise regulations in the UK, where the Noise Act 1996 indicates that running a dishwasher at 9 PM is legal, as quiet hours are defined as 11 PM to 7 AM. Many Reddit users have suggested that the original poster document the notes and report the neighbor to management, while others have humorously proposed leaving their own notes to counter the passive-aggressive behavior.