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The spammers tried to justify themselves by concentrating on Coco, although it did spill over to Kanata and a little bit to Haato. By and large the spammers were COP clipwatchers or just local breed of (underage) /pol/tard who came to the defence of the country or shit on an American or both. I wouldn't be surprised if it took them time to realize Suisei is actually living in the Holohouse. Although there were also quite a few people frustrated about the lack of collabs between CN and JP and the appearance of EN made them angry and desperate and they were just looking for an excuse to explode.
At any rate they spun their own narratives: Already before the T-Time clickbait clippers had presented Coco as some kind of American rebel who corrupts [your oshi] by feeding her real drugs and making her do lewd things, because no one in Erolive does lewd things without American influence. This formed the backbone of their subsequent narratives. Now, most fans who spoke Japanese or stuck to good translators tended to be immune to these narratives, but by virtue of having followed the Holohouse saga through dedicated fan translators, the local Hoshiyomi seem to have been exceptionally so. They seem to have been unusually tight with the JP fanbase also. Still, there was at least one Hoshiyomi who was one of the loudest of the initial rabblerousers.
Suisei also was very popular in China. She was still the lowest subbed Holo when they got interested in Hololive and I think the Project Winter stream happened almost immediately after so all the saviourfags latched to her and found fertile ground to spread the word (also in English, this was in general how the first Hololive translations appeared I believe). Suisei noticed and appreciated the boost in subs, pandered to them quite heavily (PRIDE OF THE CCP), and was loved in return. Her appearance at Bilibili World was apparently recordbreaking and since the Taiwan incident occured right after it, the most recent numbers made it look like Suisei made most of her money in China.
So the COP clipwatchers took a look at the numbers and thought she was on their side, because money is more important than friends, I guess. Meanwhile Suisei herself maintained radio silence and was anyway busy with offline stuff so she wasn't streaming all that much leaving ample room for narratives about her leading some pro-Chinese faction at Cover backrooms. I vaguely remember somebody translated a piece of fanfiction they seemed to unironically believe about Suisei slapping Coco in front of Yagoo or something.
Out of the support messages, it was Fubuki's tweet about having lunch with Coco that was first and therefore attracted the largest amount of ire, so by the time Suisei broke her radio silence at Coco's return, she was probably drowned out by everyone else doing the same. And since there was a slow burn, the antis who might have cared about spamming her probably had time to deal with it or find new things to be angry at or take their anger on the CN Hoshiyomis who kept insisting they watch shitty translations that misrepresent Coco. Or watch the good translations, realize they were wrong and slink back. The antis did eventually harass the Suisei fan translation channel to shut down, but they reformed as an Anemachi channel a week later or something and apparently this was enough to throw the antis off, because they never actually watched the streams.