You didnt even understand the point.
Raid Suit making Sanji act like someone without emotions. RS breaking Sanji's codes such as hitting a woman thats why Sanji is afraid of himself and asking Zoro to kill him if this happens again.
Sanji isnt himself when he hits her its not like he choose it.
Nah. I believe its Sanji thats why he destroyed RS. Its implied that Sanji hit her unless Oda clears it it will be Sanji that hit the girl.