Slackware is the true Unix of Linux distros

(subject is quoted from the vector linux website with the small edit that I replaced "distributions" with "distros" to fit in the character limited subject line)

What exactly does that mean? More importantly to me, how does slackware differ from normal linux distributions? What differences will I see?

FHS is shit
Package managers are unnecessary shit beacuse of that goddamned FHS piece of shit

My favourite package managers are cp and rm.