I don't think he is trolling per say. He was trying to estimate the length since one wasn't given and folks said it was big.
People post pics of random snakes saying "I caught this 12 footer in my back yard" when the snake barely reaches 6 feet when mature. Take for example, this pic:
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Dude claimed it was 10 feet. The difference in this pic from the OP's pic is that you have a point of reference with the broomstick. This one, you lose perspective with the snake being put in front of the camera.
I still think the OP's snake is rather large though. Don't feel like calculating the length though as I hate doing math on a Monday.
Freak'n 10 foot rattler. That picture's great!