Typical racist.
But, your parent summed it up nicely. It's not just name-calling. It's a concise description of the thinking and attitudes that would produce such a misguided comment: pure racism.
| If you give me a box full of cats and squid, and I pull out a creature that only has 4 legs, and I say "Typical cat" I'm not insulting the cat, I'm simply correctly separating it from the squid.
Now try it by changing squid to white and cat to black and see if you still think it's a good argument.