I don't think being confronted with an email I'd sent (or is it a form?) and being asked questions about it is natural at all. It is much weirder than actually having the conversation face-to-face.
It’s odd that you approach interviews with a confrontational frame of mind. I would totally expect, and be prepared for, an interviewer asking me to expand or comment on anything I send in as part of the process, be it the CV, application questions, code samples, coding exercises, and whatnot. It’s actually worse when an interviewer asks you questions that show they clearly didn’t read all those materials.
I fully expect to be asked about my CV or experience in an interview, I do not find that or interviews in general to be confrontational. Or even if there was a programming assignment I had to submit, reviewing that stuff is normal. What I find weird is to fill out what is effectively an GTKY interview over text, then have someone pull out it out during an in-person interview to discuss.
Also even though I usually don't feel that way, it is completely ok for a candidate to feel confronted or cornered in an interview and not at all odd.