Kufr?

As salam aleykoum, A friend of mine showed us a picture where she was with her friend. And she told us that a guy told them you’re both like Friday and Saturday because of their dresses : one of the girl is a hijabi and not the other one. Here Friday refers to jumuha salat etc (the hijabi) and Saturday (Saturday night, party etc) to the other girl because she is not a hijabi and she doesn’t dresses modestly. So she laugh about it and I don’t laugh and my heart hated what she was saying for a moment and then not : did I commited kufr ? Please advise me on what laughing about Islam means because I am always feel like I had committed kufr BarakAllah oufik