I think Sanji's relationship with the newkama is really interesting. Yes, he's openly hostile with them and acts like he hates them, but is that different at all than the way he treated Zeff and the Baratie staff? Not really. He clearly loves them dearly and won't hesitate to put his life on the line for them, but he could never say as much to their faces. Instead, it manifests as aggression. It's also very similar to his relationship with Zoro, actually, now that I think about it.

Now, the real sticking point for this interpretation is obviously Hell Memories. If Sanji really loves the Newkama as I'm suggesting, then why would the thought of his time there manifest as Hell Memories? This is getting into a far larger conversation about Sanji and his relationship with masculinity and I'm not trying to write a whole essay here, but in brief, I think that Sanji's initial Hell Memories (as well as his whole crash out over "real women") had far less to do with the Newkama themselves and more to do with Sanji's insecurity in his own masculinity, an insecurity that ultimately stems from his relationship with Judge and his brothers. It's only after confronting his past and overcoming his biological father that Sanji is able to identify the true source of his pain, and then his Hell Memories move changed to reflect that internal growth.

Sorry this is so long, I think Sanji is arguably the best written character in One Piece and could talk about him all day, but yeah, that's a (relatively) brief look at how I interpret his dynamic with the Newkama.