It's not dismissive to describe what is going on in that sort of play. You said it yourself - Bill's thoughts about the setting are the setting. Exploring the setting = learning Bill's thoughts about it. What is being dismissed?You can describe virtually any play style in dismissive or negative terms.
It was started to express disagreement with you saying that a certain playstyle is no more mother may I than real life.this thread, was started as an attack on one of my posts in that thread.
Real life does not involve a world whose content and behaviour is chosen by someone in expression of creative inclinations. Whereas that is central to the playstyle you are describing - it is Bill's creative inclinations that establish the gameworld.
Expressing that opinion isn't an "attack" on anything or anyone.