2. If non-Muslims are hurt - they should accept Islam.
If any non-Muslim considers the word ‘Kafir’ i.e. ‘non-Muslim’ as an abuse, he may choose to accept Islam and then we will stop referring to him as or call him a kafir i.e. a non-Muslim. A Muslim does not get hurt when being called a non-Hindu or non-Jew. In the same way a Hindu should not feel hurt when called a non-Muslim.