Sanji doesn't respect women, he enjoys them. Or the idea of them. Mostly in a physical sense, of course. I don't think Oda is particularly enlightened or setting a good impression of his views, but he does have female characters beat Sanji's ass until they stop and say hey, y'know what he really could be a lot worse.
The idea that some "Sanji fans" might excuse his behavior, well ... I guess that's why they're "Sanji fans." Good luck.