Then you'd lose that bet. The orange-clad fans are without question supporters of the Basque Euskaltel-Euskadi team. The photo in question was taken during a stage in the Pyrenees. You'll note that the shirtless man standing nearby (who appears to be applauding Armstrong and the Italian rider Ivan Basso, by the way) has a Basque flag draped over his shoulders. He's also wearing an orange bandana on this head.
lol okay then. Don't know anything from cycling.