A loser is NOT a person that is a nerd or a person that has a hard time fitting in, in school.
"loser": Who are you calling a loser? I'm a grade "A" student.
"loser" finishs junior high, enters high school: Wow, I'm popular now because I have high marks and I don't do drugs!!
so-called popular kid finishs junior high, enters high school: wow!! I called someone a loser in junior high, and now I'm the real loser!!