I'd say "just" is an intensifier in your example. You just don't get it, do you ? vs.
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Goodman I'd say "just" is an intensifier in your example.
You just don't get it, do you ? vs. You don't get it, do you ? "Just" seems to put the stress on "don't get it". In some cases, the opposite may be the opposite.
Don't be too hard on Johnny. He is just 5 years old. "Just" used here seems to offer a justifciation and