Thoughts on intersectionality perspective to better understand gender?

Sure. 

Did feminists say it? 

It's probably a lie. 

Demand proof. Triple check EVERYTHING they say. 

Treat them like a man standing in the shadows on a dark night in an alley and asking if he can hold your wallet for a minute. 

That's not what "intersectionality" means. It was coined to refer to the way a black woman would face sexism AND also racism. Gender is the way the patriarchy oppresses women. What is so hard to understand about "gender"? This ideology is solipsistic bullshit and outright lies. It can't co-exist inside feminism when it requires oppressive gender stereotypes as an identity to "play with". F#ck gender wankers. You aren't feminists, you're queer theorists and solipsists.