Doesn't understand the difference between loving someone and condoning their behavior.

Consider the parent of an alcoholic. The parent loves the child, but knows that alcoholism is a self-destructive habit. The parent's love is that they can forgive the harm their child's alcoholism has done, help them on the path of sobriety, and accept they may slip up.

Likewise, God loves the sinner, but knows sin is destructive. God's love is offering salvation to all rather than abandoning us to destruction.