Kim is part Armenian but erased her ethnicity with plastic surgery
Yes, there could be other reasons why she doesn't like Lopez. Perhaps she thinks she's too full of herself
If we take the time to see with the heart and not with the mind, we shall see that we are surrounded completely by angels ~ Carlos Santana

Maybe that's why this girl doesn't like Lopez. She's got talent and she probably is envious of that
She possibly may not like Puerto Ricans either
Or maybe she doesn't like J-Lo because of some other reason (maybe she just doesn't like her acting or singing or personality, etc). I have no opinion on J-Lo myself since I've never heard her music or watched any of her movies.
I doubt that racism is the reason. After all, Kim Kardashian isn't exactly white herself (she looks mixed race) and she seems to have a thing for black dudes.

I never really thought about the "envious" part, since they both have hourglass figures. Although, my FB friend is a fat white girl who said that Will Smith is one black guy that she would date (pre-Oscars), which gave me the impression that she's a racist **** who made an exception with Will for not perpetuating the stereotype. Therefore, you might be right, except I can't wrap my head around the fact that she acknowledged Biggie Smalls in her posts regarding his birthday or the anniversary of his passing.

Jennifer didn't pay for her bottom like Kim did
Maybe that's why this girl doesn't like Lopez. She's got talent and she probably is envious of that
She possibly may not like Puerto Ricans either
If we take the time to see with the heart and not with the mind, we shall see that we are surrounded completely by angels ~ Carlos Santana

No idea.
Maybe you should ask your friend why he/she dislikes J-Lo so much. Some people probably love J-Lo but hate Kim Kardashian. The only thing they seem to have in common are their big bottoms.