... Because most things involve race?

Like, clanker is the equivalent of a racial slur but for robots. The reason it works and is funny is because we already know what racial slurs are and have a contexr for it.

If racial slurs didn't exist, neither would clanker.

You have to actually think about the world we live in and why things are the way they are. Its a easy to say "just cuz lol", but we're engineers. Nothing happens "just cuz". No, there's a reason.