In my terms:
Class loyalty is a Hobie 16 wanting to support the Hobie 16 Class.
Class loyalty is a Nacra 6.0NA wanting to support the Nacra 6.0NA class.
Brand bigotry is a Hobie 16 sailor preferring Hobie 20s racing at their regatta to Nacra F18s.
Brand bigotry is a Nacra F18 sailor preferring an Inter 20 to a Hobie Tiger.
I consider the HCA to be a manufacturer multi-class association, and not a class association (same with INCA).
How does the Alter Cup Committee define class?
Somehow one class, as you define them, got two spots while others got none.