Assuming the alien visitors indeed were similar enough to us to wear "Gemini spacesuits" (a known point of debate in astrobiology - would an intelligent alien necessarily be a "Star Trek humanoid" or not) they might even have found hairy primates brandishing big sticks at them specifically interesting. Never mind a Cro Magnon or an ancient Egyptian. Given a reasonable tech level and enough time to study Earth they most likely would've found our ancestors out too.
But, as I said earlier, there is still no evidence available that they were. Here, or interested.
The dog, the dog, he's at it again!