Bitch
The character "Karen" is such a bitch to Lonnie in this movie, and, not to mention, straight up trash!
I realize Lonnie sought out a friendship with Karen as a way to escape her mundane Upper East Side existence with an emotionally distant mother, but why would Lonnie look up to rough-around-the-edges Karen as a role model? There is not one thing redeeming about Karen. Never did she demonstrate an iota of loyalty and friendship that Lonnie did. Her manners were ill at best and her brother even assaulted Lonnie and threatened to "do much worse".
In the end, even though Lonnie is a dynamic character who broadened her world and learned some life lessons, Karen remained static. Karen is little more than a user and ultimately an abuser without any regard for the feelings of others. Karen did not show any interest in cultivating a friendship with Lonnie other than for the possibility of enlisting another henchman in her shoplifting schemes. Are we really supposed to cheer on this friendship?
I think not.