Hi Crowsister - You're not expecting too much and you're not being unreasonable. It's disturbing to read your account of the meeting, and I wasn't even there. First, the lack of appropriate accommodations for a disabled person would make it an automatic no for me. Second, the facilitator of the group clearly had no consideration for your needs.
Finding the right group is a process. In order for it to be beneficial it needs to be one in which you are personally comfortable and will be able to do the work that you need and want to do. Sometimes it can take going to multiple groups before finding the right one, but it's worth it to not be harmed from being in the wrong one. The descriptions you've given of your impression of this group, and reactions to it, would seem to indicate that it would not be a helpful or comfortable environment for you. Do you have other options, either in your area or online? Is it possible to go back to your old group? Do you have an interim resource to go to for psychiatric care if needed, such as a clinic?
Subjecting a person who has been through a traumatic situation into another person's trauma can be deeply disturbing and in some ways is like being violated all over again. You have every right to expect to get support, not an experience like the one you had. I hope you will be able to find what you need and deserve.