I just don't think the post is relevant to hacker news. Every once in a while someone will post something about their "hacking" with drugs, and it's generally just dull, self-indulgent, rambling. palish is a fine HN contributor, but I'm not interested in his acid trip. Nor am I interested in salvia, marijuana, etc. Another long-time, and usually excellent, HN contributor (whose name escapes me) has frequently hocked some herbal brain boosting drug that he imports and sells, and I find those posts dull, too.
It's not that you can't say it. It's that you should say it some place where it will be appreciated. I see that it got a pretty good amount of upvotes before being deaded by an editor or pg, so I may even be in the minority (you and palish have been around about as along as I have, so it's not an "oldfag vs newfag" question), but I definitely don't care whether palish has a conversation with God tonight while under the influence of LSD.
If I wanted drug experience discussions I would go to erowid: http://www.erowid.org/experiences/
And, if I wanted repeats of pg essays on HN...well, I would never want repeats of pg essays on HN.