There is no 'negation' in the sentence in French but the phrase with the reflexive verb 'se ficher' «je me fiche de . . .» translates (in informal/familiar speech) to a negative statement in English 'I don't care about... "
See Larousse https://www.larousse.fr/dictionnaires/francais-anglais/ficher/654737#549213
Je m'en fiche! -- I don't care! I don't give a damn!
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