That's just idiotic. This has absolutely nothing to do with her being black or a woman. She's just not well liked and that can happen regardless of her sex or skin color.
I would say that her problem is very different than Hillary's. Hillary was not popular with Democrats and she was hated by Republicans. AOC is loved by some Democrats, liked by a bunch, and disliked by some while being absolutely reviled by Republicans. That would get AOC more support than Hillary got.
How is that even remotely relevant to what that person said? They're not talking about policies, they're talking about popularity and ability to win an election.
The fried chicken.