Girls especially - why do so many girls hate attractive women?

lanternhill
Ok so I have this friend who sort of exemplifies the exotic sexy look no matter what she wears. (She's half Arab half Indian.) She's not slutty but she looks attractive/like she tries, and she's very pretty even without makeup.
We were walking this morning and a car drove by and apparently a girl gave her one of those disgusted/ew/"b$tch no" looks. She got kind of upset and said she hates when women do that - she wasn't doing anything, just walking normally! She was dressed pretty averagely for the area too. I said maybe it's jealousy. Any ideas as to why they would react with such... vitriol? (Pretentious word, I know, but still.) I think women are intimidated by other women being sexy but I don't quite get why, other than competition for men (which is sad, just saying). I had about a week where I finally decided I was attractive (thank God/God willing) and acted accordingly, and I got quite a few glares from women even though I was acting normal (or think I was? Maybe being more smiley/whatever than usual?). I haven't stopped but either I tune out the glares or they've died down... but in her case they keep happening.
Anyway. Thoughts?
Updates
+1 y
She looks more Latina (slash Indian) to a lot of people here than Arab, at least to people who aren't that familiar with Arabs (as far as I can tell - she's told me that she gets mistaken for Latina a lot.)
Girls especially - why do so many girls hate attractive women?
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