For me, the biggest myth I have encountered about the Tao is that the concepts are difficult to understand. Many guru style leaders would have you believe the paradox of Taoism requires special education or training to understand (most then charge you for such classes or workshops).
I would point these people to the first line of verse 70 of the Tao Te Ching.
"My words are easy to understand, easy to practice."
The verse explains that trying too hard to understand the Tao actually hinders the understanding of it. The Tao is not flashy or attention getting, it is simple and straight forward.