she was already pissed when she got banned, apparently Neko called her a bitch. completely unprompted and not as a joke.
and, idk if you knew this, but T HATE'S it when anyone who isn't her friend calls her a bitch. Especially when it's meant to actually be an insult.
so yeah, she was angry and argumentative when she got banned. Once this passes she'll be back to her regular self.