Someone told me that there are nothing like table or chair because what there

Someone told me that there are nothing like table or chair because what there

Someone told me that there are nothing like table or chair because what there actually are is arrangement of matter and energy and label attached to it, which only exist in our minds. He thought if we accept nominalism, then we must accept this. I think he confused abstract objects with concrete objects. It seems to me that it's possible to believe things like table and chair exist while believe those concepts exist only in mind. Am I wrong?

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