Personally I would just refer to them as the LGBT community.

Most of the extra letters and terms are highly specific labels or nuances most people would struggle to understand.

For example someone has spent 20 minutes explaining why they are pansexual and not bisexual. I still can't see a difference but if that is the label they want, then they are pansexual.

The key thing to remember is the LGBT community isn't a monolith. The group exists because they are/were being opressed for their sexual identity.

You will also get people who have made the group focus their core identity. They will often be loudest but not always representative of the group.