DS is nearly 18 months old. Both he & I have Steiner dolls which we take places, feed, have in a sling, sleep with etc. DH & I treat the dolls with respect & love - as we treat DS.
DS on the other hand delights in throwing them on the ground then looking at his hands as if to say "naughty hands, did you do that?"

It's somewhat cute, but also not something we wish to encourage as we would like for him to experience a nurturing relationship with the dolls.
Our approach has been to model gentle behaviour with the dolls and when he throws them to say "balls are for throwing, dolls are for loving", and if he continues then saying dolls like kisses & cuddles and throwing isn't a nice thing to do, and then if he persists one of us will pick up the doll from the ground, give it a kiss then carry it around or put it on the doll table.
What we're doing isn't having any effect, so obviously we need another perspective

Is this something developmentally appropriate & best ignored? Is there another way we could handle things? WDYT?