Brendon McCullum's father Stuart cannot understand why critics went after his son for being too keen on limited overs cricket.

"Test cricket has always meant everything to Brendon," McCullum Sr told player turned commentator Craig McMillan during a television lunchtime show in Wellington yesterday.

McCullum Sr revealed he met his son the evening before the fifth day of the Test which saw Brendon become the first triple Test centurion in New Zealand cricket.