I was at RBA for that qualifier, too. The US was flat and listless the whole game. Second best all around. The US supporters were not outnumbered, just lulled into a catatonic state.
That's what I remember. USA fans were tense and nervous, as if they came to watch the other shoe drop and then boo a team that had been frustrating them throughout qualification. CR fans seem to come to show out, support, and have a good old time. Negative feedback loop between the USA fans and teams energy, while CR had a positive one going.