Labour leader David Shearer says insults such as those John Tamihere has handed out in the past few days would be unacceptable from a member of his caucus.
However, he would not say whether Mr Tamihere was unsuitable to be a Labour candidate, saying it was part of the "shock jock" nature of Mr Tamihere's radio job.
On Radio Live yesterday, Mr Tamihere called 3 News reporter Tova O'Brien a "stupid little girl" after she asked him whether he was a misogynist, homophobe or sexist.
He also described Social Development minister Paula Bennett as "that bloody fat girl" to the Herald on Sunday - the day after Labour accepted him back into the fold as a party member.
Asked if such comments would be acceptable from one of his current MPs, Mr Shearer said "of course it wouldn't be".