What does it mean when a guy tells you what nails he likes?

I was showing a guy friend of mine (who everyone believes flirts with me) a pic of the nail designs I was going to get, I told him I was going to cut my nails short and he very assertively said "I like them long". Then silence.
It stood out to me because of how he said it, his voice got lower and everything, it was more of a demanding tone than complimentary.
What does it mean when a guy tells you what nails he likes?
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