"We're sorry, but we can't be friends with you!"

  "W-what? Why? Was it the fish? Did you not like the fish? Was there not enough pepper on it?"

  "It wasn't the fish. We just… we can't be friends with people who use nanobots so recklessly."

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  "Lifesaving medical technology that lets people live for hundreds of years?"

  "Exactly! It's so reckless! We're sorry, but we need to leave. And I'll probably need to have my body incinerated, just to keep my planet safe from any nanobots that might be on it. Please don't call or visit us ever again!"

  "B-but… we just want to be friends!"

  And that is how the peaceful Nanokin hivemind became heartbroken and arose as the all-conquering Nano Empire, so they would never lose a friend again…