Well, I think that the comment the manager made to the child who was autistic was waaaay out of line.
That being said, (and not to be mean), if you know your child is prone to being loud (special needs or not) then take them to a place that is Designed for loud kiddos. News flash, kids grow up, and when they get to a point where they are able to eat at a nice place and be quiet and respectful of those around them.... then there should be no problems.
Then again, I see it from a mothers view too... but I lean towards the above opinion more
(I don't have kids yet)... I don't mind kids, then again I'm a photographer so I work with them everyday ALL day, they tend to blend in with all the other noise lol