It's wrong to not take cancer seriously.
John finds out his toxic ex girlfriend has cancer.
John wants to tell his friends.
John soberly tells his friends what he heard about his ex.
John goes to a bar and laughingly tells his friends his ex has cancer, and he's glad because of what happened between them.
John's friend tells them he has cancer, and they all give him support.
John's best friend starts bawling because he just found out he has cancer and John has made fun of it.