Just turn around and leave them alone. You have a better chance of being struck by lightning than being snakebit{ Unless you go and start screwing with them}
They do more good than harm by a factor of a million.
That is a Texas Rat Snake {Elaphe obsoleta lindheimeri}
Completely harmless and a voracious eater of rodents.
Thank you Hoji, I was beginning to think everyone on here was an armchair hunter