As instructor I would like to comment from the other side of the desk.
The OP did not specify who he was talking to when he was refused the chance to fly. Dispatch staff tend to be low experienced individuals and thus are given little descretion. A discussion with the CFI may had generated an exception for you.
On the other hand and at the risk of being rude, maybe they did not think you were good enough. I see discredition applied all time at school where I help out at. Sadly a significant proportion of the rental Pilots only seem to be interested in maintaining their skills to the absolute bare minimum. These pilots don't get the keys if there is any doubt about the conditions. However I have watched a relatively low time PPL get dispatched to a shortish field with a 15 kt 90 degree crosswind. There was not the slightest doubt in any of our minds that he would have any difficulty handling the conditions.