User blog comment:Magma MK-II/Patrick Star: The Discussion/@comment-27818776-20150328162101/@comment-1705775-20150328165049

it was actually proven in a canon episode that Patrick is not stupid, he knows what he's doing is wrong but he does it anyway.. although people often say Animated Atrocities make him worse than he actually is modern Patrick is pretty similar to a sociopath.. like most Spongebob characters he got darker and darker as time went by, due to the show becoming meaner spirited.

I'd say he's approaching Peter Griffin levels of nastiness, within the confines of a kid's show.