Sorry but from Sanji's declaration to Pudding in her room, his devastation to learning of her betrayal in the rain, his honest reaction to her true beauty despite the third eye, their lovey dovey moments while baking the cake, and finally Sanji sharing his first ever kiss in the series with Pudding, and the heartbreak of Pudding wiping it out of Sanji's memories, this was a (tragic) romance story through and through. Sanji's relationship with Pudding was unlike any of the women he's oogled over the years, a stark indication that he saw something deeper in her romantically. I don't even see how Ussop and Kaya's platonic relationship is even part of the conversation. I think you really need to look deeper into how developed and explored that arc was for Sanji and his relationship with Pudding.
People saying this must not keep up with the series. Like at all.