“but whoever causes one of these little ones who believe in me to sin, it would be better for him to have a great millstone fastened around his neck and to be drowned in the depth of the sea.”
-Matthew 18:6
Exactly.
Sin angers Him on general principle but this sin is especially hateful to Him and is expressly singled out for an exceptionally severe judgment.
Prov. 6; Matt. 18:6 and Luke 17:2