"Real men ride women."

That's the message Max Key posted to SnapChat yesterday, sharing a video of what appears to be himself driving past a group of cyclists.

The video, which is filmed from the driver's seat of a car, shows the vehicle passing three cyclists on Parnell Rise in front of the Holy Trinity Cathedral.

With the window rolled down, the driver shouts "real men ride women" at the cyclists. It does not appear anyone else is in the vehicle.

Key lives with his parents, Prime Minister John Key and wife Bronagh.

NZME spoke to Max Key who said he had no comment to make. He has since deleted the video.

John Key, who is currently in India, said Max had called him to explain and apologise for the "poor attempt at humour".

The Prime Minister said the post was inappropriate.

"Clearly he didn't mean to make the sort of comment that he made in the way he did but he takes full responsibility for it," he said.

- NZ Herald