I had a similar experience a year or so ago in Bournemouth when I saw the Three Phantoms. I complained to the management but they told me there was nothing could be done as they had paid for a ticket...errrr.....so had I. It's a very tricky one as far be it for me to suggest certain members of the community should not be allowed to enjoy a show but it did ruin my evening as there was constant "mooing" throughout the show.
I understand that some shows are now offering performances especially for disabled people, the autistic, and people with other problems as they and the parents and carers are well aware of the difficulty. It is a shame if someone can't go to the theatre because he / she moves about in an uncontrolled way or makes noises but in fact has the intellectual ability to enjoy it, so let's hope the idea spreads.