I don't think you have much experience of how meetings operate behind closed doors
This wasn't a council meeting
This was a meeting of a sub-group of councillors, the reform lot, who are in the majority discussing the choices that they are making and will be expected to support.
As such there are, if one compares them to parliament, the "cabinet", the leader of that cabinet, and the "backbenchers".
I think you'll find this pretty commonplace where the cabinet gets.annoyed by backbenchers who want to "interfere" at every turn.
Lord knows, the Labour and Tory meetings with the backbenchers are pretty acrimonious and they have the advantage of whips to silence backbenchers.
So, for me, storm/teacup.