“In the hadith Ibn Umar related that the Holy Prophet said: If a Muslim calls another kafir, then if he is a kafir let it be so; otherwise, he [the caller] is himself a kafir.“ (Abu Dawud, Book of Sunna, edition published by Quran Mahal, Karachi, vol. iii, p. 484)”
“"Withhold [your tongues] from those who say `There is no god but Allah’ — do not call them kafir. Whoever calls a reciter of `There is no god but Allah’ as a kafir, is nearer to being a kafir himself.” (Tabarani, reported from Ibn Umar)”
“"Nothing expels a man from faith except the denial of that by which he entered into it [i.e. the Kalima].“ (Majma` az-Zawa'id, vol. i, p. 43)”
so i suggest u all to start calming down with throwing this word around like you are allah’s specially appointed kafir-detecting agent on this planet. u literally have no authority to expel someone from islam. it reflects badly on u and on ur deen and according to the quran it makes u more of a kafir than anyone u might have called that. are u allah swt to judge who has a place in islam and who doesn’t??? a good first step would be to start minding ur own business inshallah someday you will find enough strength within your heart to do that.