In this vein of thought, reality is co-subjective at best and never objective.
We group into 'reality groups' called belief systems - this can be anything from belief in a fairy tale god who lives in the sky or belief in a 'scientifically provable objective reality'.
In groups we create reality. Alone we can create seeds that have potential to grow in a group environment. All human behaviour is governed by group behaviour.
The history of all cultures is the history of groups.
This may seem fundamental and obvious but often details are placed on assumed foundations of truth that were never there. We want solid communities - so we must be ready to state the obvious again and again - not in a patronising way but in a genuine desire to assist others to become their utmost.