All I can say is that my definition was correct from an actual practical standpoint in simple, not technical terms. For more detail, read what Kirk said and I hope you understand. He has given a complete technical definition and explanation.
Remember that your hotplate or burner is HOTTER by far than the flashpoint if you are heating as you said, and therefore the vapour will ignite if it reaches the heater. The vapour can even be below the flashpoint when it reaches a hot element.
But to get back to your comment about me being wrong in my post. I said nothing about the heating element being AT the flash point. As I have contended all along, if you heat anything on a burner or hotplate, the heating element is HOTTER than the temperature of the liquid and therefore is usuallly hotter than the flashpoint of the liquid.
I might also mention that in an earlier post you commented on how I brought the importance of the flashpoint of PG to your attention. If you knew about it, why did I have to bring it to your attention?