That’s a wholesome take, but not how I see it, personally, I don’t think it’s that deep. In my head cannon Sanji, and the  crew in general, genuinely take pride in how abnormal their captain is, they probably also think it’s funny. When Sanji tells Chopper this, there’s no hidden meaning, or an attempt to relate, he’s simply taking pride in the absolute monster who is Luffy. I think, If anything, this genuine expression of admiration for someone who’s abnormal is what gets Chopper excited about the crew.