Never said that you didn't, just pointing out that you should.
An important thing to note is that you started the meta-discussion side of it off with a tone implying that I wasn't clear enough, therefore it was my fault that you misunderstood. And you haven't said anything to reverse that stance. Misunderstandings happen, regardless of how clear you have been. It's important to resolve them, rather than argue about them.
And, even if you think someone has misunderstood you, it is still not advisable to insist that they have done the exact opposite of what they have just said they have done. Approach it from an angle of trying to resolve a misunderstanding, not to simply contradict what they have said.
And yes, this is an important part to remember. I'm not telling you off, but breaking down where things were misinterpreted and how they can be better interpreted.