Oh hey, don't get me wrong, I've been cheering for USA since the beginning of this world cup! I've only cheered against them when they played against Slovenia, but well... I'm more than glad to see them qualify from the group stage, and not just qualify but on the first place! But if you want to get into football/soccer, you'll have to understand that referee mistakes (and occasional referee bias, too) are part of the game. The point is that if you always play your best, the occasional mistake by the referee won't matter anyway. That's exactly what the USA team has done in this world cup so far - they've played every minute of every match to the best of their abilities, and even though they suffered a terrible referee mistake in the match against Slovenia (disallowing the goal for 3-2), it didn't matter because they ended on the first place in the group anyway. Also, that referee mistake was at least an honest one. There was so much commotion around the Slovenian goal that referee simply saw a foul that wasn't there. That happens because the referees are human beings, I do agree that these kinds of questionable decisions should also be reviewed through recordings during the game so a bad decision can be immediately fixed, but until that happens (and I doubt it ever will) the best we can do is enjoy football for what it currently is. Again, even that, in other cases extremely terrible referee mistake, turned out to not matter at all because the USA ended on the first place in their group.
I'm just like him, using this World Cup as a way to get excited about soccer. What the rest of the world needs to understand is that football (or soccer, as we know it, but I'll call it football for the sake of the international users) isn't a very popular sport in the United States. Major League Soccer draws pretty low numbers, a lot of games aren't even televised that I'm aware of, etc. So what you have are a bunch of Americans getting their first real exposure to football. Personally, before I read about it I didn't even know how the system of relegation/promotion worked (for the record, I think it's absolutely awesome).
In the most popular sports, American football and basketball, if there's a questionable call they go to the monitors and review it. Baseball doesn't have an instant replay system, and it takes a lot, and I mean a LOT of heat for it sometimes- Armando Galarraga losing a perfect game a few weeks ago might have been the straw that broke the camel's back- and is on path to get one. In addition, there is only one sport that allows a game to end in a tie- professional American football- and that happens so rarely it's not very thought of.
So, for an average American, low soccer IQ, watching the biggest stage for the first time, they get confused. Why isn't there instant replay? Why do they just let the clock run instead of stopping it and playing set time (still a little confused on that one, too)? I mean, we're used to bad calls, but we don't like them. We complain about them and they almost ALWAYS get fixed in our sports.
I can accept it as one of football's quirks, but that doesn't mean I like it. Americans like fast-paced high-scoring action. They don't like to watch two teams kick the ball up the field over and over without any goals. Personally, I don't get excited unless it's the US playing, because then I have a personal stake in it.
So regard this complaining as a part of Americans working their way into the footballing community, and expressing our ignorance of football's quirks that the rest of the world is so used to. If football ever gets really big over here, as this world cup may actually be helping, as MLS numbers start to climb, we'll be right along with the rest of you.