Skeezix, I’ve found racers to be nothing but blurs heading in the other direction, or past me on their way to somewhere else. They are not aggressive in an offensive sense. They do act crazy, even bubbling, crapping, fake rattling, and hissing, playing dead, sometimes biting, when captured. My advice, don’t capture them. Oh, and don’t corner them. I’ve done that. I felt sorry for the little guy, I thought he might have a stroke.
Quantum Butterfly [sub]don’t mention this to anyone going to the June 15 dopefest at Turkey Lake Park in Orlando[/sub] 
My only experience with a really large (about six feet long and really fat) eastern diamondback in the last five years was out at Turkey Lake Park while playing disc golf. I was walking–really fast–down the edge of the ninth fairway. I was in the zone you get in when the temperature is about 95 and the humidity is running a close second, near brain death. Walking along…in my mind,
stick…stick…stick…SNAKE?!..ABOUT TO STEP NEAR THE HEAD!..WTF?!..
Reptilian brain reacts (mine), foot about to miss rattlesnakes head by one foot becomes an instinctive tiptoe, the next ten steps probably looked like an NFL cornerback running a tire drill. Then I stopped, turned around, calmed my breathing, and realized that snake could have bitten me or rattled. Instead, it was just waiting for me to pass by. I then took one step back towards the rattler and it continued on to the next clump of trees about 50 yards away. My advice, don’t provoke a rattler by actually touching it and you face very little danger. Kids, obviously, would change that equation. I would not trust some adults around venomous snakes, for that matter.
Thank’s to Steve Irwin,* there are lots of amateur snake wranglers out there. Thus, the constant need for antivenom.
*Just kidding. Jackass drunken stunts which begin with “watch this” are a great tradition.