A few things:
1. The father says this is the worst thing that could have happened to an adoptive parent (notice how he says parent, making it clear that HE was offended, not her). Really? A JOKE is the worst thing that could have happened? So that's better then if she, say, got killed somehow? I know that's obviously much worse, but seriously, he acts like one little thing will make the sky fall.
2. The reporters talking sounded stupid. I mean, with such quotes as "He was shocked and really surprised!" I don't think I really need to clarify that much. >_<
3. I don't remember the game ever being said to be educational. Rated E does not mean the same as having educational values, it just means anyone is allowed to play it. Plus, if I remember, this is E10+. By that age, I'd think the child would be mature enough to handle a tiny line in a video game.
4. I do understand how this could make her feel bad. It is an insult, and as a FPS, she was likely projecting herself onto the character, which could make the line 'fatty-fatty-no parents' make her feel bad. But then I think she'd realize it's just a game anyways and it meant nothing. Of course this stops mattering once you realize she said she didn't even hear the line. I'm sure all this attention is really helping the entire issue. Thanks unnamed father for throwing your daughter in the spotlight for being adopted when you were the only one offended.