Is it cruel to only words-and/or-eyes flirt with a genuine sense of attraction, but no current intent to have sex or start a relationship?

Defining that type of flirting as looking warmly eye-to-eye or indirectly complimenting someone's appearence to them, often humorously, in conversation.

Is it cruel to only words-and/or-eyes flirt with a genuine sense of attraction, but no current intent to have sex or start a relationship?
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