The 17-18 year old high school senior who is the supposedly "picaresque" main character in this flick is utterly obnoxious in her vacant, empty, amoral approach to life. In many ways she seems younger, more like a 13 or 14 year old perhaps who is worried about being seen as "cool" so she constantly degrades absolutely everything as boring. Furthermore, I recall at that age having ethics and even budding political beliefs, while Lillian blankly moves between anarchist, far right, and vaguely leftist groups with zero feeling or development of intellect.
A terrible incident occurs about 3/4 of the way through the film that is almost entirely her own fault. She is much too old to feign ignorance that the people whom she stole from were dangerous or that her bad behavior would result in significant consequences - in this case, death for innocent people whom she's lied to.
I don't find this film amusing, and the character isn't even believable as a young woman in her late teens. I have seen reviews comparing the effect of her character passing through American current events to Forrest Gump unwittingly witnessing 20th century history unfold in front of his naive face. However, Gump was a well-written, expertly acted, and ultimately sweet film about a kind but intellectually disabled man. The Sweet East is just is pretentious nonsense. Not even sure what the director was trying to say, the flick seems to hint that the film makers are guilty of pseudo-intellectual false equivalence comparing disparate 21st century American political views.