And yet, somehow he became an okama before meeting Iva. (There's good reason to think Iva restored him to normal). His true nature is the okama way, the only reason he's seemingly so into women is because it was beat into him by Zeff, on his original ship he wasn't around any women at all and by reverse context from his talk with Nami and Enies there was a time when he was fine kicking women. His overdramatization could stem either as a nervous quirk sparked by his sudden parting with Zeff, or an actual love for Nami which given their history seems odd as the only real moment between those two was in Enies