Looking at some old archives I realized that Sayuki and Haruka were caught on tape (as in a backstage microphone hack) at a Ribbon~Inochi no Audition~ rehearsal:
As reported by Sohee on JPLOP:
Sayuki's the one she's talking to and who audibly agrees with her.
Can't turn on sound atm and it was a while since I listened to it, but she basically talks about how Karin's fans are all old rich men (the term she uses I believe is ossan, but I might be remembering it wrong), while she and Sayuki has at least some high schoolers. Which is followed by Sayuki saying something to which Haruka says "Ah but I guess we have a lot of ossans too huh? lol" Sayuki ends up saying something, Haruka asks 'who?' and once she spots the person Sayuki is talking about, she says that the fan (I assume it's a he) looks homeless.
The whole thing just pisses me off a lot.