What Constitutes Kufr?
Because some Muslims accuse each other of kufr these days just because they belong to a different sect and as we know sects mostly come into being due to the difference in the interpretations of Quranic verses and Ahadith. Stuff like “if you don’t believe that xyz is a fard (obligation) in Islam, you’re a Kaafir”.
You’re right, honest differences arising out of different interpretations of a religious text doesn’t constitute Kufr. It is the attitude with which one is sticking to one point of view which decides such a rebellious attitude, whether one is doing it with an honest understanding or one is is doing it because of some bias and prejudice, the latter will result in a rebellious attitude and the former will not.
It is Allah’s domain to decide whether one is rebellious or not, we can only point out a mistake in one’s understanding. In matters of differences in interpetation (‘ Taweel ‘) of basic tenets of religion, the right word would be ‘ Gumrahi ‘ / ‘ zalalat ‘ for that interpretation. Please refer to the video of Ghamidi Sahab shared below.