Saints/Falcons Game Problem

You can get black and gold beads with fleur des lis at most carnival shops in N.O. What about a black/gold Rebuild New Orleans cap or shirt? Those might be subtle. They sell them at Black & Gold on Veterans and elsewhere in town.
Anyway, I think your friend is overreacting. Most real fans love to talk to the opposing team's fans and have some spirited conversation. It's part of seeing the game live.