I can be grouchy and do or say things I regret later, but I have a hard time actually truly wishing anyone harm even when I'm grouchy (and generally feel bad about it even at the time), or even when I'm wronged. I also rarely truly dislike someone, it takes a lot to get me to that point. I have noticed in interactions with other people, that many people (autistic or not) have far more likes and dislikes (people-related or otherwise) than I do. Mine tend to be confined to small areas, and they can be strong within those areas sometimes, or not as strong. But most of the world, I have no particular huge like or dislike for. And even people I truly dislike very much, I have trouble wishing harm on or hating. I have trouble even holding a grudge. I can get mad at people but that's different (less long-lasting).
I am actually on fairly good terms with a number of people who have wronged me in the past, all I require for that to happen, is that they stop and seem as if they are not likely to continue (I avoid those who continue, but I don't generally seek out information on or interaction with them, why dwell on that kind of nastiness, and why let their meanness poison my mind or life?). I certainly don't forget what people have done, but I do forgive.
But those are aspects of my personality that have nothing to do with being autistic, and, yes, many autistic people can be mean, just like non-autistic people can. And despite not being particularly mean, I've certainly had my moments from time to time. I'm not claiming to be an angel, I just seem to have a different personality that way than most people in general.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams