Good Character

Backbiting

Q: Is it kufr to backbite a Muslim to a non Muslim? Also is it kufr to complaint against a Muslim to a non Muslim if he has harmed you for the purpose of correcting him so that he doesn’t do the same mistake again?

Laughing at someone

Q:

1. If someone is short or black, will laughing at them be kufr because Allah made them like that? It will be as if a person is indirectly laughing at Allah's decision.

2. I heard in a hadith that Moosa (alaihis salaam) was dark in complexion (black or something). Will it mean that making fun of someone who's black because he is black like indirectly laughing at Moosa (alaihis salaam) too.

Discussing one's sins with others

Q: I understand that it is a sin to discuss one's sin with a friend due to it showing a lack of shame. What if I am the one who hasn't committed the sin, but it's my friend that is talking about matters that relates to his sins with me? How should I handle these conversations despite already trying to give da'wah? Do I get sins also for indulging or contributing to this conversation since it might be displeasing to Allah?