I think you have it backwards. "We" haven't sexualized young girls so much that we think teased hair, heavy makeup and provocative poses for six year olds is merely "cute".
In fact, it's exactly the opposite. Little girls shouldn't be sexualized by teased hair, heavy makeup and provocative poses. "We" support THAT position by our disgust at parents who dress their children up and encourage them to behave like this. We hate to see these little ones sexualized by their own parents.
I agree completely with you on one thing. They don't know they are being sexy. They are completely innocent. That's what makes it even more sick. It's the adults who are foisting this on them.
Nobody's minimizing what you think. They are merely posting what THEY think. Fancy that!
I sincerely hope that we get past the "beauty pageant" mentality that turns women into sexual objects, and turns men into leering perverts.