Logically, Riku knew that Sora was trying to help. That was his job as both a ruler, and his lover. But all Riku heard was, 'you are being ridiculous', from TWO people who had never had to grow up questioning if their parents loved them. Neither of them understood what this was doing to him, and he was just starting to feel judged and like he was disappointing BOTH of them.
"I can't do this right now," Riku said instead, standing and moving away from the couch, crossing his arms defensively across his chest. "I don't want to talk about it. I don't want to do this."
"You don't want to," Corin repeated angrily. "Our parents waited 15 YEARS to find out what happened to you!
"And they know!" Riku snapped. "I don't think putting another day between my receiving their response and replying to it is too much to ask!"