For example, there were 7 units in Oak Park, Illinois sponsored by the local PTAs where said PTAs refused to renew their charters unless the local Council allowed them to ignore sexual orientation when registering Scouters. A number of the parents apparently didn't object to this. The local Council (Des Plaines Valley Council) refused and refused to renew the charters. Most of the Scouts moved to other units. There are numerous sponsors such as the Unitarian Universalists, the Episcopal Church, etc., that sponsor units and object to the BSA's policy in this matter. And remember that about 45% of Scouts are registered to units sponsored by secular organizations, such as the VFW, American Legion, Odd Fellows, Elks, PTAs, public schools, etc., that either have no official ban on homosexuals or even have anti-discrimination policies that include them as a protected class.
Now, whether individual units of these organizations would actually register avowed homosexuals is another matter. Your child wouldn't actually have a gay Scoutmaster unless your unit decided to register one, and as a concerned parent you'd certainly find out about that if you wanted to.