It indeed was a bit too aggressive, but these things needed to be said.
In Tsubasa's case, true, you can't do much about you emotional reactions when it comes to something like this, something you haven't been taught how to handle. And it's not exactly your fault you feel this way, because we can't just will certain kneejerk responses away.
And yet you're absolutely freaking responsible for your actions, and in a poor attempt to "defend" herself Tsubasa chose the worst possible words to say to Kaede.
So maybe we can't make her feel safe and happy thinking about things related to sex, yeah whatever, it's not our job.
But she could very much benefit from learning how to keep her mouth shut at times.