What I saw is that they desire to belong, be deemed cool, and popular. But since they oftentimes have been wallflowers all their lives, they never achied this. Some go on to mock everything that's deemed popular, some accept their lives and are happy with their quality of relationships, instead of the quantity, and others spend most of their lives trying to be liked by people who don't care about them, while taking for granted those who do. They cannot love the people that love them, because they don't love themselves. Hence, they subconsciously perceive the people who love them as flawed and broken for loving them, because deep down they believe themselves to be unlovable. Instead, they try to prove to themselves that they are lovable by attempting to become popular, because they believe that if they can convince the popular people who don't care for them to care for them, then they themselves must be lovable after all and all their problems will suddenly disappear in the blink of an eye. ... Yeah, this shows them mixing up Fi for Te.
So they sell themselves out to the cool guys who don't care for them, try to fit in, and eventually become just like them, while losing everything that made them good and special in the process.
As @
End would put it: "It's all about attachment."
I think that the desire to be popular is characteristic for Se-introverts, because a similar thing happened when a former LSI friend befriended the teens who didn't like me for not playing by their whims. I'm rather on my own than someone telling me when to laugh, what to like, and what to enjoy. It was way too Alpha for my tastes, so I didn't fit in with that. The LSI with his desire to be popular tried to be friends with both them and me simultaneously. I can tell you that that didn't work. Damn, I really sucked in my teens at Fi-evaluating my friendships with people. I recall my ESI mom already having bad feelings about some of them, but I ignored her warnings, because I was a teen and teenagers ignore their parents.
Fortunately I have gotten better at befriending the right people, because for the past half a decade such a thing hasn't happened anymore with any close friend. Even more, now it are my friends who warn me for trouble like the money ESI-Se.