It's amazing how many people I know assume they're cotton mouths and shoot them on sight... It's easy to tell the difference even from a distance but most people seem pretty ignorant when it comes to snakes.
i live in outback Australia. around here, we ALWAYS assume that any snake is venomous/dangerous.
heck, we have highly venomous snakes that look almost identical to harmless pythons.
had a damn bandibandi hanging around my archery target a couple weeks ago.