bellissima - I understand your distress and you have certainly given me an insight in to a world I knew little of. However, I really don't think the op was trying to belittle these problems. I think she was making the point that this type of activity was not unusual for her son and so would not, in and of itself, justify exclusion from a trip.
You will know that ASD children are as different from each other as all other children are but they are united by deficits in social skills, including an inability to generalise, which can be very hard to deal with. My own 7 year old is a lovely, passive boy but he lashes out ferociously at his little brother when angry. He is, however, not a bully, but a child who cannot manage his anger. Acknowledging this does not mean I have no sympathy for my younger child.
It is quite legitimate for the op to post about her concerns about her son's inclusion. I don't want to put words in her mouth but if it were me, this post would not mean I didn't feel sympathy and great embarrassment for my son's actions and I think it is unfair to read something into a post like that.
I think it is the second time today I have read a post which has not contained the usual kind of supportive language we extend to each other here. This does not mean we agree with what everyone says, but that we understand that this is a safe space and as we are judged everywhere else, we should be entitled to express our concerns without being flamed here.