This story is very interesting: parents of a disruptive youth in Bertha. MN have been hit with a Restraining Order to prevent them from bringing their severely autistic son to Mass http://abcnews.go.com/TheLaw/Story?id=4885322&page=1 As a devout Catholic who is legally disabled, I wish to give my two cents worth.
I have no problem with Mr. & Mrs. Race coming to Mass, so long as they don't bring their disruptive son. Mass is supposed to be a time of quiet contemplation, and anything that distracts from that shouldn't be put up with. If a baby starts crying during Mass, parents know to take it outside until it calms down. Given that, why do the Races think their son should be any different?
If Adam Race (the autistic son) wishes to receive Eucharist, The Church does allow for an Eucharistic minister for the sick (or - yes - a priest) to bring him Eucharist outside the Mass.