They are correct though. There is no evidence that chimps walked out of Africa. For two reasons:
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They can't walk for that length of time because we're the ones who walk everywhere, they hang out in trees.
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No one ever said they did.
I'm wondering if this person has ever even seen a chimp, to be honest.
They are a bad scientist.
They have decided they don't like a thesis and are looking for reasoning to explain those feelings. What they are not doing is trying to understand the evidence for the thesis. They believe that science is one person saying the viewpoint they already hold is how the thesis they don't like or understand is 'disproven'.
They are not curious for discovery, they are curious how to explain their pre-existing worldview in "science-y words" because they feel unable to reconcile their faith with reason. In another life they would have been the monk writing how the patterning on flowers is proof of Jesus' suffering.