What is the ruling on someone who posted on Facebook: "Whoever sees herself as a , do not comment"? Does this constitute slandering all women? Is his statement considered apostasy or merely forbidden? And what is the ruling on someone who laughed at this phrase?

It is forbidden to insult a Muslim without a just cause; it is considered a major sin and an act of wickedness, especially if it involves slandering women or accusing their honor. It is not permissible to laugh at someone who insults, as this implies approval and participation in the sin, but it does not reach the level of disbelief (kufr). The Hadith (definition) is authentic: "Insulting a Muslim is wickedness (fusooq), and fighting him is disbelief (kufr)." And wickedness is disobedience. Likewise, a Muslim is one from whose tongue and hand other Muslims are safe, and a believer is not one who slanders, curses, is obscene, or vulgar.