One aalim calling another aalim a kaafir

IS AN ALIM PERMITTED TO CALL ANOTHER ALIM A KAAFIR IF THE ALIM PRAYS FOR THE OTHER PEOPLE WHO DIED IN A TRAGEDY, MOST OF WHOM ARE KAAFIR.
OVER THE YEARS I DEVELOPED A GREAT RESPECT FOR THE FORMER ALIM BECAUSE OF HIS STAEDFASTNESS ON THE HAQQ AND HIS INTELLECTUAL REASONING.
WHAT SHOULD I DO.

DID MOULANA NAVLAKHI APOLOGISE TO YOU AFTER SWEARING YOU.