Depends on what you mean by “love.” Here are some different ways to look at it (and these are somewhat ad lib … and thus probably might be off here and there):
Love, in this case, could mean …
Love: Wanting what’s best for someone:
Now, for humans and angels, the best thing they could achieve would be heaven. However, the devil has eternally rejected heaven, and God therefore does not work for what is best for him, and thus in that sense, God does not love the devil. However, even though, in consideration of what the devil essentially is (an angel), heaven would be the best place for him … in another sense, heaven would not be the best place for him. This is because his will has turned against heaven, and thrusting heaven upon an unwilling creature would be worse than hell (the sense of shame and unworthiness would be overwhelming … this is according to St. Catherine of Siena). Thus, in another sense, because God withholds heaven from the devil and does so because it is the best thing for him (according to what he has chosen … not according to his essence), God loves the devil.
Love: Desiring something as a means to an end:
It is natural to love things if they provide you with the means to achieve a more ultimate end. However, we should not use people in this way (and thus we should not love people in this way). Also, we likewise hate things that impede our efforts to attain a more ultimate end. God can be said to hate the devil in this way, since the devil tries to impede His efforts to save souls. On the other hand, it’s God’s plan to bring good out of evil. I read in a book about St. John Vianney, and during an exorcism of a woman, the devil confessed through the woman: “God makes use of demons to revive the faith . . . . Must I then serve as an instrument to instruct men, I who am raging to damn them?” And perhaps because of this, because God can mysteriously use demons to bring about salvation, God could be said to love the devil.
There is also the thing, of course, that God loves all being (that is, all things that exist). And since the devil exists, God loves him.
So, it depends what you mean by love. In some sense, God hates the devil. In another sense, God loves the devil. I hope that made any sense whatsoever. I hope I didn’t utter heresy. Pretty sure I didn’t.