To me it’s because she has a rat face and a plain Jane flat body with no curves. I just find her hair style and everything about her looks unappealing and boring.
It has nothing to do with her as a person or her personality.
I am not a fan of Jennifer Lopez or her music but she is at least physically attractive. She has a good looking body and face with some curves which I find attractive.
I am happy for you that you think she is attractive. I do not find her attractive at all. At best she’s extraordinarily average and no sex appeal what so ever.