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Yeah, the erratic writing style is weird and unsettling. But it was most of all critique rather than hate.

'I feel sorry for you' is hate.

Hate is disdain for another; thinking someone is pitiful is pretty much the epitome of hate.

"I feel sorry for you" could just mean he genuinelyb feels sorry about David being "brainwashed".

It could. But not in the context of a sentence where he's calling Dave ignorant.