How do we reconcile the report of Allah manifesting Himself to His servants on the Day of Resurrection while laughing, with the fact that Allah becomes angry on the Day of Resurrection?

Question:
The Honorable Shaykh, may Allah grant you success, says: Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him) quoted from Ma'mar al-Asbahani in his creed, saying: Shaykh al-Islam Ibn Taymiyyah quoted from Ma'mar al-Asbahani in his creed, saying: "And He manifests Himself to His servants on the Day of Resurrection while laughing." How do we reconcile this with the fact that Allah (Mighty and Majestic) becomes angry on the Day of Resurrection with an anger like which He has not become angry before or after?

Answer:
O, glory to Allah! He becomes angry and He laughs, glory to Allah! He laughs at His believing servants, and He becomes angry at His disbelieving enemies. He becomes angry at one group and laughs at another group, and there is no contradiction between them.