Will every person I have cursed among the Arabs take from my good deeds on the Day of Resurrection, and will Allah compensate me with good deeds from Him for those whom I cursed after my repentance?

Generalizing by insulting all people or all Arabs is an injustice, because among them are Muslims and disbelievers. The Prophet, peace and blessings be upon him, said: "Insulting a Muslim is wickedness, and fighting him is disbelief." Repentance for this is accepted by Allah, for He, the Most High, said: "And He is the one who accepts repentance from His servants and pardons evil deeds and knows what you do." There is a difference of opinion as to whether it constitutes backbiting unless specific groups are named, because the speaker may not intend to generalize the insult. However, if the intention is to generalize, it is considered backbiting. And one who repents from sin is like one who has no sin.