SocCal
Yes you are quite right that "see and avoid does apply". I phrased it badly, in that, certainly in my limited experience, some IR qualified pilots flying high-end, well equipped aircraft will be looking to practice their instrument procedures. There is a temptation to think that because they are following the laid down procedure, everyone else will get out of the way, or should not be there. At my local airfield, we have radar controllers, so Bob's situation should be minimised, although it still happens.
There is also the case that a VFR pilot can truck on blindly across a marked ILS approach line, so it does work both ways.
My response was that it is better not to argue with a bigger aircraft, but get out of its way as soon as a likely conflict becomes apparent.