Hewlett agrees with sandberg that women must be more assertive , but she believes sandberg simply doesn 't understand that there is a " last glass ceiling , " created not by male sexists but by " the lack of sponsorship , " senior executives who persistently advocate for someone to move up .
But lynch notes that his findings are not about , " sexists like sexist jokes , and racists like racist jokes , " but rather the conclusions show that laughter often acts as a hard-to-fake or honest signal of the somewhat unconscious beliefs we all hold , whatever those beliefs are .