OP, I have said that I have now changed my mind, having followed this thread from the beginning, but IF you don't have a full understanding of what your DD's sn entails, and IF you have no understanding of how her school transports works, your OP doesn't make it 100% clear. You say
"DD has asd and a statement which covers her from the moment she leaves home to the moment she gets home."
OK, so if a poster just reads your OP, and doesn't read the whole thread, the assumption (and I made it too) is that the statement covers her until she GETS home. There is no mention, until later, of the adult-to-adult handover clause. Now, I did not realise, and I am sure that many are in the same position, that this was how it is supposed to be done. So whilst you're flinging your accusations of lack of brain cells around, please bear in mind that what YOU take for granted (ie that a child with sn must be passed directly to an adult), and what I fully understand now, having learned it from this thread, is not obvious or a given for someone with no knowledge of sn who happens to come across this thread.
You can't put the onus for knowing about your specific situation on others. Had you put in your OP that the rule is that your DD must be handed over directly to you, then I don't imagine anyone would be questioning that you were NBU.
It's kind of like me posting "AIBU to be annoyed that my buggy wouldn't fit on the bus?" then when people disagree with me, shouting "yeah, but I've got TWINS, thicko".
Please don't tell me that having twins isn't the same as having a DC with sn - I know that - just making the point that if you don't supply all the information (especially on AIBU) you can hardly insult people when they respond in a way you didn't want.
That said, I do NOT think you were unreasonable. Just wanted to say that again before Tiredmum decides to make me her next target.