They try to tell me that I'm just like the others
But I ain't all bad

from Justin Bieber – All Bad Lyrics on Rap Genius

Meaning

Selena’s friends try to convince her that Justin is no different from other jerk guys. and it should be “But i aint al bad”, meaning that he will make mistakes, but thats not the part that counts. What counts is all the good things he has done for Selena.

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