Statement of Kufr

Assalamu Alaikum I wanted to know if this constitutes as kufr or not. My Baby cosuin was wearing a shirt on which was written “Good looks , courtesy of Daddy” . I know that the looks of a person are made by Allah and this is shirk but When his mother jokingly said “no courtest of mommy” I also jokingly said no “It is written courtesy of daddy”. Does this act alone constitue kufr even though I no intention of endorsing anything like this but just said what was written.