I agree with the first two answers, these type of people have their own problems and are selfish, inconsiderate, and toxic to be around. They don't even like themselves, they have life issues and try to cover it up, or not think about it by being hurtful to others. I know a person like this...others do what she wants and don't try to say anything to upset her, because if they do, she will let lose. Very manipulative, better to not be around this type of person. Of course, when this type of person, is around someone they are trying to impress, or get close to...they can be so nice; but, like you said, it's fake. They are doing it for a reason, to get something they want.