Leaving people out of a group...

Although now I hate people who make fun of others or leave them out on some important things, i know reflect that I was once like that too.
In my old class 1i2 there was someone who was, you can say, different from all of us. He always did stupid things and scored very badly for results causing our class MSG to drop. Truthfully we all hated him. Even me. But know, thinking back about it , i shouldnt have done all the things that we did to irritate him. We always called his name wrongly, we would make fun of him behind his back, we would do a lot of things that are very irritating. But he managed to keep calm. Truthfully, I trust that he didnt mean to do that... that he was a nice guy deep deep down. Anyone who sees this post probably would know who I am talking about.
He's not in our class anymore.
He has left our life forever.
There is no more chance for us to seek forgiveness...
It's all just too late...