It clicked in 1986, when I was a red belt. At that point, I didn't know the difference between "traditional and sport" (and I don't think there was then) but it didn't matter. My entire TKD world was in the school with my instructor as my God like person. Things were so simple back then, no pads, there was one guy (in my world) making up the rules, everything made sense.
After I made 1st Dan I learned of the ATA politics, the ITF - WTF split, and just how many TKD school's of thought there are. It was an eyeopener to say the least.