Boyfriend and rape jokes..

So.. My boyfriend makes rape jokes but they're mainly about... Himself.. I've never been raped but he has. By his uncle. They make me uncomfortable because idk wtf I'm supposed to do. He's laughing at it but I feel it would be bad for me to laugh. Idk! Example: Today his brother was talking to him about how their uncle used to want to be a professional saxophone player and his brother also said "For an all boys school". And my boyfriend said "In A Minor". They both laughed. They were both raped by their uncle and honestly wtf am I supposed to do when he makes those jokes. Laugh? Say I'm sorry? If this is how he copes with his trauma then it doesn't feel right for me to tell him to stop