The one thing that brings a smile to my face is the certainty that Mac Walters is sitting wherever completely perplexed that people hate that kid so much.
"Bu...bu....bu... It's a human kid! Everyone loves human kids! Why wouldn't that traumatize a Commander Shepard who may have brutally killed several of his own squad members! I don't get what the complaints are about!"
For why I think this, witness the 1up interview he did before the game's release where he got hammered on the whole Earth-focus of the pre-release stuff.
He's actually indoctrinated and knew everyone would hate the kid, it's an angle to help people push forward into buying the ending DLC.