Is it unkind for a man to still stare at a female friend, look at her breasts, eavesdrop on her conversations and tease her when he rejected her?

In favour of another woman and even still he has a wandering eye? Like it’s not showing respect to his partner or his alleged ‘friend’. Would I be right in saying this?
Is it unkind for a man to still stare at a female friend, look at her breasts, eavesdrop on her conversations and tease her when he rejected her?
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