When I had complainers like that, it usually meant they were guilty of something, themselves. I had one who complained about everyone around her, then complained about her ac constantly. Maint swore on everything holy it was fine. Long story-short, she had family staying with her and didn't know how do lock them out and wanted to transfer (+they had bed bugs). Another complained about everyone around her throwing trash on the ground, not picking up after their pets, loitering. Turns out her neighbors were confronting her about parking in the handicap spot without a tag. But she swore she deserved it cuz "her feet hurt and she's old" (her words) Oh, and another complained that the sidewalk was too cracked and made random complaints about people that live on her sidewalk route because she wanted us to assign her a spot in the back where residents illegally parked. I've had a few complainers like that, and it usually means they're trouble.