I think this is actually pretty accurate. For example, in the teacup ride chapter, Kibako calls out to Futaki without thinking, so the attention is there. Also, Futaki brought up Sachi's previous insult, so she's more socially conscious than her expression would let on, hence her whisper, which was calculated to fluster Kibako. Finally, Futaki's apathy at Sachi's desire to avoid fixing the ride matches with Futaki's mischievous "LOLOL" at the end, since Futaki does what she wants without a lot of consideration for others.
