Kiddie porn should remain illegal, as it involves people who cannot legally consent to it. Any sane libertarian would agree with me (emphasis on “sane”).
and then there are the ones who want to abolish the age of consent
Small l libertarians believe in individual freedom and responsibility for consenting adults - not for children. Small l libertarians by and large recognize the need for different standards when it comes to children. It could be that what some people see as small l libertarians are anarchists who have for political reasons put on the libertarian disguise. Like that guy who said he knows libertarians who favor decriminalizing kiddie porn - I seriously doubt they were bonafide small l libertarians if what he is saying is true.
And as for these ads, frankly, as long as equal opportunity is presented for tobacco and alcohol adds I don’t any reason to be bemoaning this. If pot adds could be shown alongside those tobacco adds from the early days before the anti tobacco lobby crushed them, I don’t see what’s wrong with that.