From: east coast, usa
... the red circles are enemy supply points ...
I don't think I said that. I know that I didn't want to get into a ten minute explanation of what all the different circle colors represent, so I skirted the issue. I think what I said was there are two sides, one blue and one red. If you are blue, then the enemy would be red, and if you are red, the enemy would be blue.
It really is confusing, maybe some day it will be changed. But maybe it is important to some folks and it will stay as it is. For me, I only pay attention to the numbers, the different colors I ignore [they have to do with hexes changing control during a turn].