Edgar is right. And it's really annoying. Bad ruling on this. My assumption is that OTC technically targets your opponents card, not yours. It's the destruction of their card which activates the destruction of yours, not the actual spell itself. Not a 'direct' spell so to speak.
My man, I already explained it on my previous comment, I even specified
"If OtC were to target and tribute a Dark normal monster on field then Freed would negate it" but Freed is not immune to the destruction effect. You explained it a lot clearer anyway so kudos.
To clear the confusion about this I will explain directly to the point, can Dark general Freed negate Order To Charge? no.
Why? because Order To Charge doesn't target on the initial destruction, the only time OTC targets is when you pay the cost by "selecting" one of your normal monsters as a tribute to "destroy 1 monster on the field".
OTC is NOT specifically targeting a monster on the field.