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I suppose it is supposed to be tongue in cheek but as a native english speaker i also find it awkward even though it might be correct.

One would argue that there is no such thing as being stuck in traffic. You are the traffic and thus part of the problem. So it is not that badly phrased. ;-)

If the intent was to communicate a pause, I think an ellipsis would be the way to go.

"We agree that the worst person to be stuck in traffic ... is you."

One source for this is item 7 at https://www.merriam-webster.com/grammar/ellipses-definition-...

Non native too, but I think "The last person you want to be stuck in traffic, is you" is a better phrasing here. It avoids accidentally calling your customers the worst anyways.

Not a fan of that comma, but it's probably there to make the best of an awkward sentence structure.

It is correct, but phrased to be surprising.

The biggest problem is that random comma.

As a native speaker, this is awkward phrasing.