I'm going to take Dick's side in this. But I'm going to hedge my bets. More on that later.

First of I believe he agreed that there is a difference but slight. At least that's what I've seen. I built Esquires and TriSquires to sell back when I was young. And I sorta had a production line setup. And they've got rubber band on wings. And I had a bunch of different airfoil templates I wanted to try. So I'd make wings with different airfoils and cut the saddle to match on the next plane I built. I always got to fly them so could directly check out how the airfoil flew. And a lot of them lasted awhile so I got to see how they worked over time (could recheck how they felt compared to a new airfoil I'd just sold).

I really don't think many of my customers had a clue that their airfoil wasn't the "factory" one, which if I remember correctly was just a ClarkY. I was never perfectly sure that any airfoil handled differently than any other. Granted, I really didn't try any wild things, but I did more than a couple of symmetrical ones and a number of different LEs on flatbottoms that had different thickness. I had lift/drag/AOA plots for everyone that I tried so I knew what incidence to set the wing into the fuselage, so wouldn't have been confused that what bad rigging would cause was what the airfoil performance was.

OK.... what all that told me back then was that airfoils as different as ClarkY versus symmetrical really flew about the same. I also understood that in our imperfect laboratory (the flying field) it's darn near impossible to accurately measure performance. And that we can't hear speed or see AOA worth spit.

Now, all that said..... Yeah, no lie, when I fly a trainer upside down that has a cambered airfoil wing, it usually takes more elevator to fly level than a similar trainer that has a symmetrical wing. But those two different wings carry those very similar airplanes around nearly identically.

And to throw a small monkey wrench into the ideas stated.......
I designed my own thermal gliders for 10-15 years and did a bunch of different wings for a couple of my 2m fuselages that held the wings with rubber bands. Those wings did do differently. But truth is, nobody but me ever noticed any performance difference. I THINK I felt a difference but there was no way to measure it. And I'm convinced that I could pick out the right wing for the conditions, but never could tell for sure.

BTW....... I've got a symmetrical wing on a trainer and have taught a number of people to fly with it. Some of my students have flown it and then their run-of-the-mill "lifting" wing trainers and commented how mine "lifts" better. That was years ago and there were only a few trainers and most had flatbottom wings. Mine flew like it had more lift from the wing. It couldn't have, right?