Now to be fair, that's a pretty Catholic attitude. We go to mass to give worship, and hopefully receive grace. The separated brethren often go to get their "battery" recharged, not "enjoyment,"and I for one am not going to hold that against them.
So while I find no issue with a special needs person interrupting my ability to follow the service, I can see where an Evangelical could feel "slighted."
If that's what they're going for, they have some serious issues with their spiritual lives.
No Christian should be that dependent on Sunday morning services.
If they're walking with Christ as they should, church should not be necessary at all. (Yeah, and I know someone is going to jump on that, but they ought to think about it before doing so)