He didn't come across as scornful to me, nor did he seem to be glaring. I thought it was pretty polite rebuff to the question. But everyone interpets things differently.
Garrett filmed the session, so it should be posted soon.
It's entirely possible I was reading too much into it, granted. And perhaps scorn isn't the right word; maybe defiance? He was very measured and polite on the surface, but to me this seemed like a very pointed question (to my ears, the lady might as well have thrown the glove down) and Jim responded with just as much, but much more effectively veiled sass. "I don't try to inject my politics into my writing, and I don't like it when people do that". That's how I remember his words (paraphrased, of course), and at some point I could swear I saw him squinting back at her with something like annoyance. That final look he gave the crowd when he was done, that shrugging "so yeah, wadda ya gonna do" face really sealed it for me.
Again, I might be projecting; I hate it when people inject politics and social commentary into stories for its own sake, especially when it detracts from the narrative. Hearing Jim say what he did tickled me to no end. If I catch the video and it turns out not to have gone down how I remember it, I'll be sure to amend my statement.