Unfortunately this may be more common than some may realize, although this particular community facebook page is transparent in noting its policy.
As far as I can tell, here is their policy (which is not located in the About section but is merely a post floating around with the other ones):
This page is for parents who have real gifted children who are frustrated by the new kind of "gifted" child. If you want to troll I will delete and ban you. Only supportive comments are allowed.
Apparently "troll" means simply asking for clarification about what "the new kind of 'gifted' child" even means.