I'm well-known as a hardcore anti-railroading, anti-GM-fiat person. However, reflecting on things recently, I've realized that all my most contentious GM interactions have been with GMs who didn't obey AW's dictum to "Be a fan of the PCs." I'm actually willing to be slightly forgiving of a *little bit* of heavy-handed bullshit with rules or rulings, as long as I feel like the GM actually knows who my character is and respects who they are.
I mean, in many ways this isn't some deep insight: if you bother to build good relationships with the people around you, you have more room to make mistakes. But in the case of an RPG, I think the key about the way Vincent concisely articulated this principle is that it's not just about the real people, but also about each player's avatar in the game. Know who they are and what they care about, and you're also respecting the player's choices.