I really don't think name calling is necessary. I mostly try to read HN without reading names, but some people, like grellas, earn a reputation by repeatedly making insightful comments. Plus, I don't think any of us here deserve to have our opinions called "stupid." You've been here a bit longer than I have, so I know I don't have to remind you, but in case others are reading, let's try to be slightly more civil.
As an aside, this is the second post I've made in as many days defending the comments of HN regulars. It almost sounds like I'm trying to appeal to the local "cool kids" for some strange reason, but in reality I just don't want to see some of HN's valuable contributors chased off by lowering the level of discourse when things get tense.
This exchange between Arrington and jwz strikes at the heart of the mythos that drives the HN community, so I realize things can get heated. As a startup founder myself it made me think carefully about some of my goals. Let's not allow that to lower our standards.