I grew up with rattle snakes in SD. We generally had an agreement. I exercised due caution and gave ample warning when approaching fence lines, brush piles and when walking criques etc. In exchange they stayed out of the yard, hangar, barn and other out buildings. If I encountered them on their territory I walked around and left them alone. If I encountered them in my territory, they got shot on sight. Rules are rules.
The only time it was ever a major issue (i.e. shot more than 1 in a year) was when a developer started putting in a housing development on a ridge line a couple miles south of us. We had a big influx that year, and I'm pretty sure they were displaced by the development going on.