That's definitely not true.
That being said, I'd buy an argument that said women are more likely to be aware of these issues. Or even that women are less likely to be sexist. I suppose I took issue with your assertion that women are MUCH less likely to be sexist. I guess it's an argument of degrees.
My memory is a bit fuzzy but from interviews I've read with models, most of them (male and female) are against the "power structures" you're talking about. The only model I'm friends with is definitely not the sort of girl who believes her place is in the home etc.