In my experience with Rattlesnakes, granted it isn't that much, but so far they are pretty passive unless you just do something stupid. Once at Fall Creek Falls we found a monster laying across a trail to an overlook that we had passed just 5 min back. He was much larger then this guy but only had three or four rattles. Now that was scarey. He wouldn't move off the trail so we found a long stick and pushed him away. He never rattled or showed any kind of aggression towards us.