For older kids with disabilities, this gets scarier. In a past life I worked at a grocery store and we employed a bunch special ed kids who were highschool age and older. There was a partnership with a local intermediate school; it helped these kids a lot to get work experience in the public. The school had someone working beside most kids for the first few days, but after that, they were mostly treated like normal employees.
For the most part they were a load of fun, some were good workers, others were huge slackers with giant smiles that let them get away with so much. But when some of them got angry, it wasn't like how most people get angry. They can lose control and when the "kids" are bigger than you it can be intimidating.
The school gave us some guidance on what to do in bad situations. We always tried to back off and give them space, tried to calm them down, keeping cool ourselves. Then lead them to a safe room away from a crowd of other people and just let them vent and be a friend instead of a foe. They always calmed down after a while and life went on.
There were some pretty hairy situations, but escalating a situation like that will only push people to lash out more. SpecEd kids, they need some slack. It's easy for them to end up in jail, or out on the streets. Cutting them slack, calming them down, and really talking to them... it can work.
Looking back on it, working with those kids was my favorite part of working in that store. I think a lot of folks I worked with would feel the same way.