Surely one who claims to be 'laissez-faire' would understand its meaning. That is, 'hands off'. That is, you have no business to parent someone else's child.
In fairness, he isn't trying to parent other people's children, not in any anti-market way. To do so, he would have to lobby the government to make a restriction upon movies with possible transexual imagery. He isn't. He is simply trying to warn people that this perceived transexual imagery exists...
It doesn't make this perceived danger any less absurd, but it certainly doesn't make LFC's post anti-market.
It doesn't mean he doesn't have a right to try to inform them. That is NOT "parenting some1 else's child".