What's frustrating is that I was correct in what I said each time, I just reversed the terms of reference to talk about the duration (1/60th sec being a greater duration than 1/2000th sec) rather than the value (160 being *less* than 2000 numerically), with obviously great potential to confuse. I even read it through 3 times to check I hadn't done exactly that, as it's something I have done before, but still managed to do it anyway!
You're right about getting out and trying it, these concepts will only start to stick once you have had an opportunity to try it, failed, looked again at why it went wrong, then tried again. With my old camera I was frustrated at not being able to get longer exposures until I finally bit the bullet and got a tripod, then it became obvious why it wasn't working.
Sorry for suggesting anyone using Auto is a wimp :-[

My advice to use Av is really only one step away from that, as I base my general photography on 3 choices, shallow, medium and large depth of field. Normally I leave the camera on f2.8 or equivalent to make the most of the available light, if I am concerned that the area of focus provided by this is too small then I move it up to f8. If I want a full landscape then I stick it on a tripod and wind it up to f32.
These are effectively the same choices that are made when macro, portrait and landscape picture modes are selected on most cameras.
I'm reading a book on composition at the moment as I think, despite my fleeting understanding of the technical side coming a close second, it is the weakest element in my photography :-/