I had a thought about "me Fern Brady me Fern Brady"

In Fern Brady's song, she says John Kearns is obsequious and Dara is an imbecile. But, then when they talk about it in the studio she says John isn't obsequious but Dara is. So then why did she write the song that way?

My thought was: if she calls Dara obsequious, then she has to call John an imbecile*. At the time she still didn't know that John had been purposefully trying to lose in the team task. Maybe she suspected he had genuine cognitive impairments, and it wouldn't be ok to joke about it?

(*There were also 2 other teammates, and the 2 hosts that she could have substituted into that line. My thinking here is that, since she had already worked with 2 of the teammates, she felt it was right for the song that they were the ones to get dissed individually.)