My Belladonna Cove Sims tend to have a little grudge with any townies and apartment social group townies with the last name Cleveland. I tend to picture the game generated Clevelands as this weird offshoot, just as problematic bunch, usually there's fights, more often than not, those townies get into fights with other townies (totally not influencing them to brawl.)
Most of the time though, I let the townies be, they don't really get involved in my neighbourhoods unless they're something more specific like a vampire or witch, though there's one downtownie with the blond hair and flat cap who often ends up moving in with one of the Sims in my neighbourhood.
