There are plenty of things to get upset about, but this isn't one of them. Seems to me like a guy that is just trying to grab his five minutes of fame... and in this case he's REALLY reaching. I hope Valve doesn't give it to him.
I'll be painfully blunt, the heroic orphan/adopted kid has been a staple of fantasy for a very long time, ever heard of "Little Orphan Annie?" well, to be honest in those stories people frequently DO say bad things about orphans and adopted kids, especially if the tale begins with the kid in a cruel orphanage. The relationship between Annie and Daddy Warbucks also has had it's ups and downs, heck even in the movie, him just wanting an orphan for a PR stunt to begin with and how that hurt her was a central theme before everything got together.
To be blunt if a kid can handle the crap going on with the Dursleys in "Harry Potter" they can handle some sneering robots. To put it bluntly "Harry Potter" involves child abuse and a constant cycle of psychological cruelty, remember this is a kid who is literally kept in a cupboard under the stairs, while his uncle's actual son (who beats on him and so on) is
given two bedrooms. Seriously, while intended to be funny, I think not many people put that into perspective, and that's children's literature.
So basically, going by other examples in the same rating catagory, this is absolutly nothing.... and I'm not saying that in a "shut up, your not a gamer" fashion, I'm speaking literally.