Uttering statements that lead to kufr
Q: Recently I have heard one scholars speech regarding kalima e kufr (saying bad words about Islam even in a joking way) can cause an individual to become a kafir and his nikah will break.
Actually my wife used to make comments about my beard some times that she doesnt like it and it doesnt suit me. The scholar said that saying this will make her a kafir (in the video).
Please suggest whether my nikah is valid and if not then how do I renew my nikah.