Were it me I’d be bothered by the fact thatThis isn't the first time that a volunteer group has been rude etc to me. I wish I understood why it's bothering me so much this time.
1. They asked for additional assurance or guarantee because they didn’t trust me
2. They didn’t take me advice when I told them no other photographer would accept their terms
3. They dumped me unceremoniously when my prediction came true
4. When they lost confidence in the other photographer at the last minute they came back to put me in the position I already told them no professional would accept and they already found out professionals wouldn’t accept
So you did what a professional does and refused.
But for them to treat you like this is terrible, and it should bother you.
All you can do is console yourself that they lost a good photographer, lost a good savings, and at the end of the day they saved you a lot of trouble and work that truly wouldn’t be appreciated.
It’s almost never worth working with difficult clients.
Dodged a bullet in my opinion.