This reminds me of a guy I flew with...On a turbulent 5 mile final into ORD, he called out (very commandingly-like) "YOU ARE TWO KNOTS SLOW."

What do you say to that ridiculousness? Just to add to the fun, our speeds at that time were Vref+5. Two days after this, our speeds were changed to subtract the extra five knots. That would have left me 3 knots fast.

Point is, don't be a fool and argue over an occasional one or two knot gain/loss...none of us are that good.