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If they insist on making fun, you must leave them.
Allah says: “If you ask them (about this), they declare: “We were only talking idly and joking.” Say: “Was it at Allah, and His Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) and His Messenger that you were mocking?” Make no excuse; you have disbelieved after you had believed. If We pardon some of you, We will punish others amongst you because they were Mujrimun (disbelievers, polytheists, sinners, criminals, etc.).”