Is this comment from a 9 year old boy normal to his teacher normal?

I am a teacher and sometimes I say good girl or good boy when my students do well. There is this one boy who is quite clever but his response took me by surprise. He said I’m not a boy I’m a man and your a girl not a woman. He has said that he is not a boy but a man to me a few times now. I don’t know what to make of this. He is quite bold to say this to his teacher. He is well behaved and a great student but this comment shocked me. My teachers used to say good boy/girl when I was young so I didn’t see the harm in it
Is this comment from a 9 year old boy normal to his teacher normal?
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