No, we don't! We all can choose to get up and go elsewhere. Except, of course, the poor band that has to play for one person who is screaming at them.
It is said that music can sooth the savage breast. Maybe if the band played a lullaby.

Bands in the Villages are probably used to odd people being in their audiences as would most of the Villagers I have met. There are many people in the Villages with memory care problems of varying degrees of severity. Look up sundowning for instance in which a patient with dementia or some other mental problem starts yelling.

Weed? You mean dandelions, righr?

This is now a world without common sense. Allow some screaming screwball to disrupt the enjoyment of music by hundreds of law abiding folks, night after night; place a (silent) plastic flamingo in your front yard and the authorities are all over it like a bad rash.

Hey! Who you callin' odd people?

He is hardly a "screaming screwball". And the Squares are a public place. A flamingo on your yard is a violation of property agreements.

A note about sundowning by seniors. This is probably a lot more common problem for nightly entertainment than some man with Asperger's trying to enjoy himself in a public place.

How to Deal With Sundowners: Advice From Caregivers | CaringBridge

Sundowning and dementia | Alzheimer's Society

Its very generous of you to attribute his behavior to a medical condition. But, I believe your compassion is misguided. He does not scream off the square or at Walmart. More likely he is just an attention seeker gaining his attention at the expense of the band and everyone else trying to enjoy the music on the square.

So I could take an airhorn down to the square and start blasting it with impunity? There are limits. And zero screaming over the band is the only reasonable and enforceacble limit.

I'm sure no one would fault someone with dementia (and I suspect their caretakers would seat them towards the back). But, there is no excuse for an attention seeker getting their attention at the expense of the band and everyone else trying to enjoy the band.

No use. He screams over quite ballads and even Christmas carols.

That is a deliberate attempt to distract from the musicians' work. A man with a mental condition-- Asperger's-- who gets excited because of he music is a different matter entirely. And I doubt if the band has any problem with him at all. https://www.youtube.com/watch?v=aTKHZeP-IZQ

What makes you assert he is an attention seeker? He is there to enjoy the music along with others.

If I have a man or woman loudly talking to the screen when I am at a movie theater, I usually just leave the theater. If others have to endure this I would get an attendant if there is one around and have her ask them to be quiet.

This man with Asperger's though is at a band playing at a Villages' Square. He has a right to be there.

Having played music professionally back in the day I can assure you no band welcomes a banshee disrupting its performance.

That is quite an overstatement.