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A Macbook Pro is made from aluminium. Most other laptops are plastic. Metal-on-metal scratching would be quite different to metal-on-plastic, so I'd say it's relevant.

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Why is it quite different? Is it that aluminium is a poor material for a surface likely to suffer repeated abrasions?

Maybe he doesn't like the noise it makes...

I think it's the fingernails on chalkboard effect of similar hardness. Soft plastic against hard metal doesn't quite screech the same way.

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