As parents, does our child's gender give us the right to dictate who they should be?

No, of course it doesn't. So why do so many parents feel it is their child bearing right to dictate who their child should be because they are a boy or a girl? I have witnsessed little boys pushing prams down a toy isle in a store, to see fathers snatch it away from them, as though it was sealing some sort of homosexual fate for their son's future. Mothers directing their daughters out of the toy isle with the toy cars whilst quipping "these are for boys".
Our son has a colourful array of clothing, and he even has a purple buggy and pram.... will this make him gay? No. And if he does turn out to be so, then what? Well, then nothing. Because once he is happy, healthy, respects others and has a kind heart then what more could any selfless parent want?
I have known people in my lifetime, gay friends, who because of how their family would react, have said to me, "I am gay, but I will marry a girl".
That then, is an endless circle of ruined lives. All because of a parents ignorance not judge their own child. The heart of this is surely an insecurity within the parent? Which, in turn will create an insecurity in your child.
Just because you have a son, this does not mean he has to play with toy cars, if he does not want to. And, maybe more importantly,  if he wants to play with his sisters doll, let him. This won't make your son gay, no more then a little girl who wants to play with toy trucks will make her any less of a girl.
Why then is it that so many parents have gender specific regulations for their children? Our children are surely going to grow up to become who they are meant to be regardless of whether they choose a boy, or a girls toy, or what colour clothes they wear. As parents in todays world, more then ever, I myself do not believe we have the right to push, or force our children to be who we want them to be. All that will do is cause friction in parent and child relationships and boost many an insecurity in your childs self esteem for many years into the future. As a mother, it is my duty teamed with my unconditional love, to encourage and nuture my son's personality, and input values of kindess and respect whilst creating awareness of right and wrong. Discouraging him from mistreating others , dispresecting his parents and peers, and as he grows, deter him from any dark paths he meets along his journey through growing life.
We must encourage our children by making them feel safe, and keeping them healthy, mentally just as importantly as physically. We can do all of this without dictating their lives to them. Because, as a parent,  there is as I believe such an huge difference between encouragement and dictation.
So as a parent, is that not something we should focus on being more specific about?