This is what "esoteric" as in "esoteric religion" means - although it's necessarily not intentionally hidden or shameful to explain, it can just be very hard to explain.
Like, driving a car is an esoteric modern ritual, because you can't learn how to do it by reading a book about it. You have to actually practice it or have someone show it to you.
It's one of those tales where you really benefit from having prior experience with the SCP universe, but it works for new readers anyway because you're supposed to be a bit lost at the start - the reader's knowledge arc roughly follows O5-8's.
https://scp-wiki.wikidot.com/we-need-to-talk-about-fifty-fiv...
> An antimeme is an idea with self-censoring properties; an idea which, by its intrinsic nature, discourages or prevents people from spreading it.
Also, I have to say I love the idea of antimemes. You don't want some ideas to spread? Make it shameful to even admit you have them. It works.