I can only imagine. On the other hand, most other languages don’t have such an awesome and powerful array of offensive words. I mean, there’s such a VARIETY of them, all offensive for different reasons. Racial words, toilet and bodily function words, words that are literally related to being cursed by God, offensive words exclusively about stupid people, words related to sexual intercourse, words specifically made to offend genders and sexual orientations, etc, on and on. It’s impressive, even to a native speaker, when you really sit and think about it.

I think it comes from the sheer number of other languages that are related to English, as well as the fact that we’ll just steal words from any other language, faster than just about anyone else.

EDIT: I’m not at all implying that other languages don’t have words for all those things I listed. It’s just that most other languages don’t have the same categorization of “these words are swear words” that English does. As I understand it, most other languages have a much shorter list of words that are specifically taboo for anyone to say, in a polite context.

Rudeness in many other languages is more defined by the manner of speech, the degree of formality, etc. But we English speakers have this lovely category of words that are both nominally “forbidden,” yet also used all the time, by almost everyone.