Cera operated the most "robust environment" she had experienced, in having worked in "half dozen or so" government departments.
Therefore, she said people needed to "get past the breathtaking PR snow job".
The woman at the centre of the incident had done more for the post-earthquake Christchurch community "than many people I know", Ms Nixon said.
WATCH: Roger Sutton explains why he quit
She criticised the State Services Commission for its "useless" investigation into the claims, especially after the complainant had "jeopardised her career" by laying them in the first place. "I for one have no confidence in their ability to conduct any unbiased inquiry after today," said Ms Nixon.
"People don't resign over hugs."
• 'You're telling the story, honey' - Sutton interview from the archive
Mr Sutton, a father-of-three walked in to a press conference hand-in-hand with wife Jo Malcolm yesterday to announce his resignation, of his "own free choice", effective from January 31 next year.
"Hugs, jokes ... I do do those things, and I've hurt somebody with that behaviour and I'm very, very sorry about that," Mr Sutton said.
"But I am who I am. I have called women 'honey' and 'sweetie', and that is wrong. That's a sexist thing to do, and I'm really sorry."
His wife said the investigation process had been "hideous", and her husband's "hugs and jokes have been misinterpreted".