And he was wrong.
L2::: On the opposite side of Earth from the Sun, the orbital period of an object would normally be greater than that of Earth. The extra pull of Earth's gravity decreases the orbital period of the object, and at the L2 point that orbital period becomes equal to Earth's. Like L1, L2 is about 1.5 million kilometers ( 0.01 au) from Earth.

JWST will be located in an orbit about L2, the Lagrange point on the outside of Earth's orbit.

Now, about sounding stupid. I and most of my colleagues maintain that any honest question is never stupid, but there certainly are stupid answers. For example, the answer you got qualifies as one of those. When one is being either flippant or general, the better answer would have been, "Somewhere between Earth and Mars." Still a stupid answer, but at least a bit more accurate.

Allegedly there are billions of galaxies out there. It's hard to wrap one's head around that.

It will probably programmed in a geosynchronous orbit outside the confines of Earth's atmosphere to increase visibility. Probably similar orbit to Hubble telescope. Here is a description (probably more info than what's requested, sorry) of the telescope's location:

The telescope must be kept very cold in order to observe in the infrared without interference, so it will be deployed in space near the Earth–Sun L2 Lagrangian point, and a large sunshield will keep its mirror and instruments below 50 K (−220 °C; −370 °F).

[en.m.wikipedia.org]

In celestial mechanics, the Lagrangian points (/ləˈɡrɑːndʒiən/ also Lagrange points,[1] L-points, or libration points) are the points near two large bodies in orbit where a smaller object will maintain its position relative to the large orbiting bodies. At other locations, a small object would go into its own orbit around one of the large bodies, but at the Lagrangian points the gravitational forces of the two large bodies, the centripetal force of orbital motion, and (for certain points) the Coriolis acceleration all match up in a way that cause the small object to maintain a stable or nearly stable position relative to the large bodies.

[en.m.wikipedia.org]

Each stable point forms one tip of an equilateral triangle having the two massive bodies at the other vertices. In the Earth-Sun system the first (L1) and second (L2) Lagrangian points, which occur some 1,500,000 km (900,000 miles) from Earth toward and away from the Sun, respectively, are home to satellites.

[britannica.com]

If they know the answer to a stupid question, they learned the answer themselves at some point. If they don't...

Will it not be in earth orbit … so as to service it from time to time?

I love listening to experts ..just listening

One doesn't need to know technical words to ask intelligent questions!

Most people love questions about there work. I am sure he was happy to explain.

meh, that's the same as with most any profession with some depth. I try talking bike mechanics with a professional bike mechanic and I try to not sound stupid ... but I do. People try to talk about local criminal procedure and unless they're familiar with it you can tell immediately that they have no clue what they're talking about. I just stopped worrying about what people thought of me so much. get rid of the ego and you find many things become much more rewarding.

No one with any wisdom, ever judged anyone for not knowing something, after all it is just an chance to share, and knowledge costs the giver nothing but brings great joy to both.

Stupid is not knowing, and thinking that, not knowing, makes you smart.

You are a wise man.

Webb will very likely make a big difference in the way we see the cosmos . . . it is made to be able to look way back in time, to see the longer wavelengths of light . . . . definitely looking forward to it. Best way to not find yourself asking silly questions is find a book on astronomy and read it . . . . it is a very fascinating subject, the distances and extremes are amazing . . . .