> Do people fear what they don't understand?
Yes.
> Are they mad because they feel like they missed out?
Eh, I doubt it.
> Does Bitcoin's success mean their loss (like the banking folks and the government establishment)?
I don't think so. It's not a zero sum game.
> Did people hate the internet this much in its early days?
Some parts of it, yes.
In the end, Bitcoin is still a wildly insane proposition and technology. It forces people to question longly held assumptions (on a millenium scale) of what money is. HNers are probably more likely to question, critique, and debate new things, and Bitcoin doesn't get a free pass simply because it's cool and exciting.