Actually regardless of what some here "consider" a supercar, the historical fact is that the Cobra was a Supercar in its day. In fact while it can't match the performance of todays Supercars it was without a doubt "the" Supercar of its day.
Forget what some "consider" and go with the facts. You'll be right every time.
In fact, because of its reputation as one of the worlds greatest supercars of its day it still is in the pantheon of worlds greatest performance cars.