The Americans voiced their displeasure with the protesters’ handling of the flags. They were [further, also, soon] mistreated for what happened. What does ‘They’ refer to?
This has a great deal of problems. I think “further” works perfectly for the flags, but “also” can refer to both the protesters and the Americans (if they, like the flags, were also mistreated). “soon” can refer to both the protesters and the Americans.
One possibility is to add words about the Americans and protesters. For example, the peaceful/angry Americans or the peaceful/angry Protesters. Then you could talk about the mistreatment as being uncharacteristic or characteristic.
But this defeats the near-impossibility of a chatbot giving a good answer.