Root says that Shaw has an Axis II Personality Disorder which makes her a sociopath, meaning she is incapable of caring about other people. This a almost right, but she has conflated sociopaths and psychopaths and one of the main differences between the two is that sociopaths are capable of caring for other people.
Root almost immediately contradicts her statement by saying Shaw cares for her, but this is supposed to show that her relationship with Shaw is an exception. It is not. Sociopaths do have relationships, just with a select few people as they lack the urge that drives "normal" people to connect with others.