Please provide writings (rules) from 1400+ years ago.
"and speak kindly to mankind." (Quran)
So no insults of anykind?
What kind of Stupid Question is this?
Where's the Common Sense?
God created man and gave him a brain. So that when he's all alone and lost and he don't have the books with him, he can atleast use his brain to find his way around.
UTD...
Prophet Muhammad (pbuh) led a noble life throughout. He had prophetic characteristics even before he became a prophet, which was at the age of 40. Even before Allah SWT sent the following verse to Prophet Muhammad (pbuh), the prophet (pbuh) never used bad words or language for anyone. What that basically means is, this is as much a matter of common sense and social sensitivity than anything else, and even if one doesnt read the Quran or follow Islam that vigorously, he/she should have enough common sense to know that using bad language or insults is bad.
*49:11 O ye who believe! Let not some men among you laugh at others: It may be that the (latter) are better than the (former): Nor let some women laugh at others: It may be that the (latter are better than the (former): Nor defame nor be sarcastic to each other, nor call each other by (offensive) nicknames: Ill-seeming is a name connoting wickedness, (to be used of one) after he has believed: And those who do not desist are (indeed) doing wrong. *
Nope, bad language is not allowed whatsoever anywhere.
It's provocative, insulting, degrading and can lead to all sorts of harm.
So please avoid.