Sentimentalist" is the abuse with which people counter the accusation that they are cruel, thereby implying that to be sentimental is worse that to be cruel, which it isn't.
To argue that we humans are capable of complex multifarious thought and feeling, whereas the sheep's perception is probably limited by lowly sheepish perceptions, is no more to the point than if I were to slaughter and eat you on the grounds that I am a sophisticated personality able to enjoy Mozart, formal logic and cannibalism, whereas your imaginative world seems confined to True Romances and tinned spaghetti.