I totally understand that mentality. I'm just saying I've found it helpful, sometimes, to let other people have the last word. Sometimes my original statement stands for itself and doesn't need to be reiterated.

I don't necessarily think you were being unreasonable. I don't have enough information to really judge that, especially if it comes down to tone. I'm just saying in general that if you're going to do things like this, to keep in mind that the other person is also testing and judging you. Maybe he didn't care about good customer service and your heuristic for determining a good vendor worked, or maybe you tripped his heuristic for determining a toxic customer and he decided to write you off. To some extent that'll have to happen, but it's worth maybe a moment's consideration. That's all.