IMO, you don't have to be an "expert" on interpreting the FARs ... the input,
expert or not, of everyone who flies is important on this one. Obviously, we
should always be scanning everywhere, but there *are* specific areas where
majority of us *initially* look for traffic said to be in various stages of the
traffic pattern, i.e., *on the extended runway centerline* for other "traffic
on straight-in final", and it's important to your own safety and the safety of
others that you *are* there when your position is announced, either by yourself
or by an ATC.

The issue isn't who is "right" or "wrong", but rather the arrogant,
disappointing attitude that being "right" makes it okay to put yourself in a
spot where you **KNOW** other pilots won't expect you to be if you are
instructed to make "straight-in" final. The ATC thought it was enough of a
concern to call it to your attention ... instead of understanding and
acknowledging WHY she felt it was important to do so, you are ticked-off that
she mentioned it, concerned about not being "wrong", and playing semantics with
the arguments. If this isn't just a great exercise in trolling, I hope, for the
safety of everyone who shares the sky with you, that you get over it soon.