NEW : Allegations ` ` extremely serious and must be investigated , '' Grigorieva spokesman says . ' Eszterhas says that Gibson spews ` ` looney , rancid '' anti - Semitic . `` You live in extreme isolation from the real world , '' Eszterhas wrote . Gibson denies the allegations , said he is upset over his script being rejected . Eszterhas says his son witnessed one of Gibson 's rants .
NEW : Allegations ` ` extremely serious and must be investigated , '' Grigorieva spokesman says . ' Eszterhas says that Gibson spews ` ` looney , rancid '' anti - Semitic . Gibson denies the allegations , said he is upset over his script being rejected . Eszterhas says his son witnessed one of Gibson 's rants .