The center was limited to 11 points and six rebounds as the Kings slipped to their third defeat of the season.
Horford, who led the Hawks with 27 points and 10 rebounds, told reporters: "My teammates did a great job of disrupting him and were digging real well and keeping him off balance.
"Any given night he can be the best big man in the league. Mentally, I feel he's stronger this season."
The Hawks are in action again tomorrow against the Denver Nuggets.