Pointing the Finger
There’s nothing more annoying than being blamed for something you were not responsible for. It’s pretty surprising in this situation that Dylan knows the parking lot area more than his landlord Dennis does. Dylan was probably pretty annoyed to be bothered by this while relaxing in his apartment after a long day at work.
When Dennis saw four cars in the parking lot – the same cars that are parked there every day no less – he immediately accused Dylan of throwing a party. How did he not recognize the exact same cars that he sees every day? Maybe this landlord is way too much of a homebody.