I am not going to lie, when I was young and ignorant I would make dua to Allah asking him not to grant the duas of the Muslims I hate. They were not good Muslims because they bullied me and so I asked Allah not to grant their wishes. I think I was wrong to do so.
My main question is that in the afterlife when Allah will finally show himself and speak to us. (I know he can speak but he won't after testing us.) If a person gets rewarded lets say with a palace, and a jealous hater will ask or argue with Allah that he/she doesnt deserve it. Like kids, if one gets candy the other kids say mean stuff behind its back. That is what I am afraid that it will happen to me. This boy who hates me said behind my back. "I am going to make dua so she will stop desiring to have what she wants so when she gets to Jannah she wont get i because she doesnt want it,anymore." Is what that boy said sinful and haram?
Plus, once I was asked what I wishes for on Eid and when I told them in the afterlife, they laughed at me saying it was nonsense and ridcilous. I thought Allah could do anything.
Is laughing or discouraging others from dua haram