Henry has every right to be upset. Emma had lied to him. I knew this was going to happen the moment Emma first lied to him in S1. He'll probably forgive her. But he had a right to be angry.

Upset/angry, yes, but I agree with athousandsmiles on one specific point: Henry was wrong to liken Emma to Regina. Sure, Henry is a young kid, and as one, he said whatever emotionally, impulsive thing was in his head at that moment. Still, the statement itself is definitely a major exaggeration on his part. Emma's lie doesn't put her in the same company as Regina.