Mr Simpson took umbrage at the criticism and confronted her at her workplace.
Nothing wrong with that - Ms Muir should be prepared to take what she dishes out.
It is part of being an opinionated columnist.
But Mr Simpson's behaviour and conduct were odd, to say the least.
He asked personal questions about Ms Muir's daughter's age and schooling and declined to elaborate on the relevance of his queries.
He made sure Ms Muir understood that his wife was from a founding Northland family and was well connected.
I doubt Mr Simpson was inviting Ms Muir to a family reunion.
There was a clear "big cheese" impression left with some vague references left wide open to interpretation.
Ms Muir is a 1.7m tall cafe owner, mum and part-time newspaper columnist.
Mr Simpson is the 1.8m-plus chief executive of the Whangarei District Council.
She says she found Mr Simpson's visit intimidating.
She could also be forgiven for finding it confusing, given the obtuse manner in which the conversation started.
Never mind, Ms Muir's democratic right to express herself has not been quelled by Mr Simpson's visit - she writes about it today on the facing page.