As I understand, God forbade Muslims from becoming angry at one another. So, can Allah become angry at a Muslim, even if the anger is not directed at but for the Muslim's situation? Shouldn't feeling anger only be an instinct from human nature that we try to overcome, and should not be a nature of God, as he determines our fate after death?
Our philosophies for what God should or should not be are irrelevant. God does get angry it says so in Qur'an:
غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ - not of those who have evoked Your anger وَغَضِبَ اللَّـهُ عَلَيْهِ - Allah has become angry with him
His anger like all His other attributes is not like human anger.
لَيْسَ كَمِثْلِهِ شَيْءٌ - There is nothing like unto Him
This is stated in Al-Aqeedah Al-Tahawiyyah.
Allah becomes angered and becomes pleased, yet not like anyone else besides Him.