Yes, let's use blanket statements to justify our preconceived notions. I'm not sure what the conclusion you're trying to push here -- feminism is about women having rights. Including the right to complain.
But didn't you just do exactly that by calling the parent's thoughts preconceived notions?
Edit: parent changed his/her comment after I posted my criticism. Originally it was much shorter and only wrote that the parent's comments are preconceived notions. No context, no nothing.
It's unfair to change the context of someone's reply after they've posted it, and confusing to other readers.