I've never had any of the "You have traded with our worst enemy" or "You made an arrogant demand" go down, they always stayed the same, even though I never traded with them again 
Also the negatives should go away if something happens between those two civs. Here's an example:
China and Mali are friends, I decide to attack Mali, then China starts to hate me. Then at some point later Mali attacks China, but I still get the "You attacked our friend" diplomacy hit from China, even though they hate each other

Also the negatives should go away if something happens between those two civs. Here's an example:
China and Mali are friends, I decide to attack Mali, then China starts to hate me. Then at some point later Mali attacks China, but I still get the "You attacked our friend" diplomacy hit from China, even though they hate each other

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