When you take the time to write a detailed, clear and concise message, and they reply with, "what?"

That's not even close to making sense, when you think about it. It was a written message. I don't know what they were expecting to hear, so I never know what I'm supposed to say back.

I know it wasn't written with disappearing ink, so I'm sure the message is still available for them to reread if they missed something. If any of it was unclear, it's up to them to explain which part. Dont expect me to rewrite the whole message in a different way if only part of it was unclear.

I know that one word reply is usually not meant literally when it's a response to a written message. It's usually meant to express outrage. When it's a reply to a spoken message, there are usually two possibilities; outrage or to prepare a lie.

People try to use it to prepare a lie when responding to a written message, and that's the "what" that pisses me off. To that "what," I tend to get snarky.

A typical response of mine would be something like, "it'll take me much longer to rewrite it than it would take you to reread it. Reread it." ..or, "if you couldn't hear what i wrote, try reading it out loud. Idkwetty..."