I'm guessing no devs have ever encountered a snake in the wild if this is how they think they react in the wild. It's getting a little old just walking through the woods to have a snake come from pretty far away and chase me till I am either bit and poisoned or am lucky enough to be near a stream.
I think they should be a danger, but currently it's a little ludicrous that a snake would hunt you like they do currently. Maybe change it to a 50/50 they aggro you when you lift a fallen log and definitely do if you attack them outright. Maybe even if you step too close to them or something.