assalamualaikum :)
here are some productive tips on how to tame people with this bad habit.
some? actually only one. hehe.

what if you found out that your friend blurted out a word of profanity ?
hmm, how to handle this delicate situation ?
please don't let these people have a regular interaction with kids *upss :P
attempt to limit their interaction. haha
cause children are the best mimickers ever ! it's a troublesome if they inherit these bad habit.
and parents will have a continuous battle with kids to get them stop using those word.

mention them this hadith in which Rasulullah S.A.W said :

Whosoever believes in Allah and the Last Day, let him say good or remain silent.”

Abu Hurairah (may Allāh be pleased with him) reported: The Prophet (peace and blessings of Allāh be upon him) said, “A man utters a word pleasing to Allah without considering it of any significance for which Allah exalts his ranks (in Jannah); another one speaks a word displeasing to Allah without considering it of any importance, and for this reason he will sink down into Hell.” 



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