King Arthur, I agree with you 100%.
Snow was a child, who was manipulated by Cora in a particularly vicious way. When she told her Regina’s secret, she honestly thought she was doing something good. She had such a great mother, that it was difficult for her to imagine that a mother could be so evil. For Regina to hate a child so much and for so long is just not acceptable. Besides, look at all the people she hurt just to get her revenge. Those people had nothing to do with what happened. It’s just plain evil. If anything, this episode made me despise her even more.
For me, it also hints as to why she wanted to adopt Henry: she wanted to be the kind of parent her mother never was, and instead wanted to be like her father (hence the name). It’s ironical that she failed miserably: the kid hates her just as much as she hated her mother. And she is just as evil.