Pignoramous

A person who remains knowingly and rudely ignorant of social norms and generally accepted civil behavior.

Pignoramous is a person who: Walks in a bike lane; pushes their baby in stroller across a busy street while the traffic light is still red; cuts in line; acts like they don't know the rules when they really do! Essentially, a person who takes advantage of the system and disregards any respect for others through their selfish actions.