I would let him talk and not give it any thought at all. They are sooooo inaccurate.
I was told I was gonna have a small bub based on fundal height and just the fact that I wasn't huge and had only put on 12 kg. DD was 3.9kg (8lb 9oz) a week beforeher due date. My friend was told at her 36 week growth scan tha her bub was gonna be a "whopper" and already measured 4kg (somewhere around 9lb) and had her son via c/s (due to his "enormous size" at 41 weeks and he weighed 3.9kg (like my DD). So my daughter wasn't small as they thought and her son, although a good size, was by no means enormous.

An 8 lb baby sounds like a great, healthy size. Slightly above average, but not by much. Definitely nothing to worry about.
My nan had 6 babies all just over 5kg (11lb) all homebirths.

Size and date estimates get more and more inaccurate as you go along. Go by the earliest measurements.

Sometimes I wonder why health professionals even feel the need to make comments like that...

Saša