The full context here is that this is the girl who was called a boy speaking, in response to the story about her gender being called into question.
"みうらちゃんはきのうジャンボさんに男の子って言われたから今日は女の子なんどよね"
"よけーなこというな。つーかずっと女だって言ってんだろ"
Which, really, I guess just means Toritoribe was right even without the context! さすがとりとりべさんですね
I'd go in this case with something like,
"Since Miura was called a boy by Jambo yesterday, she's saying she's a girl today."
"Don't say crazy stuff. Really, I'm sure I've always said I'm a girl."