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To me it seems like her environment/the people she hangs out with always tell her what she's doing is perfect, that she never gets useful feedback from them to actually improve herself. Several of her friends strike me as people who just want to profit by being friends with Jenn, of course these people are not going to go against her. Besides that, it's much easier to dismiss valid feedback and say "they're just haters" when you get criticized. Jenn is taking the easy way by blaming other people for "negativity" instead of reflecting and growing as a person.