Suppose Jim believes that he has a long-lost elder brother, and in order to become the next Marquess of Winchester he strives to hunt down and murder that brother. The above is incompatible with Jim's being virtuous, but it is logically compatible with (though psychologically unlikely to coexist with) Jim's loving every human being, since Jim's belief might be false, and he might thus have no long-lost brother, and hence no failure of love for that brother. Thus, loving each human being does not entail being virtuous.
But loving God—that's a different matter. For if one loves God, then one is thereby disposed to love all that God has made. Thus, Jim, while he does not fail in love of any particular neighbor, does fail in love for God.