Well, Blueblood was only a minor character who showed up in one episode and drove Rarity absolutely crazy, but man did he leave in impression on everyone. Worst. Prince. Ever.

And those are both things Twilight might bring up, but she's under the impression right now that this is simply a gap between their worlds, and that Kayneth's viewpoint is simply how his world works and not just, you know... him being a dick.