It's been an issue of fascination to me that at some point, maybe around the 18th century, English users developed this concept of "bad" words - words that were taboo to use in themselves, NOT for the content of them. "Poop" is OK but the other term is taboo, "copulate" is fine but the other word is taboo. In ancient and medieval writers you'll find references to "things too shameful even to speak of," but they meant the SUBJECT one was talking about, not the words being used to talk about it.
It's about the same time that English started to drop its familiar pronouns that one would use for loved ones, friends and family - "thee," "thou," "thine," etc. - and started referring to everybody with the same distant, formal "you" as though your mother was some kind of stranger or your boss. Grammar rules became more formal and artificial too, like the nonsensical "shall/will" rule or the silliness about not ending sentences with prepositions.
I suspect it had to do with cultural shifts and anxiety over social status and "polite speech" was a cultural code to mark oneself as of a superior and respectable class, perhaps since practically everyone was starting to become literate.
As far as our own time and this forum, still, the fact is that these cultural codes persist and, as others have posted, it's the forum owner's wish that it be polite and friendly to all ages. Hence the rule.
Amazing really.
Not only does this thread not get shut down as you'd have expected, but even in the midst of the silliness, we are treated to a linguistics lecture.
I do love TB.
