Kit - You need to pay attention. The reason DTD wrote his last line was to make it clear he did not intend to take off from a contaminated runway but was seeking to expand his knowledge.
The reason people are having a go is that the tone of your response was entirely inappropriate (which actually suggests you did not read the last line and are trying to save face... or you are non too bright).
There are too many people on PPRUNE who don't take the trouble to read,understand and then respond in a condescending/objectionable manner.