Your organization treats people in a very "exclusionary" manner. ( Meaning that it is a group that is not accepting of others not of themselves.
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1What's wrong with "exclusionary?" It's in the dictionary. dictionary.reference.com/browse/exclusionary?s=t– Benjamin HarmanCommented Jan 13, 2016 at 12:55
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1When I read your title I immediately thought "exclusionary". It's the term commonly used for this.– Hot LicksCommented Jan 13, 2016 at 13:02
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If not exclusionary (new word to me) then exclusive?– DanCommented Jan 13, 2016 at 13:59
4 Answers
There is 'cliquey':
Cliquey, the adjectival form of Clique:
1 - a small, exclusive group of people; coterie; set.
www.dictionary.com
A group that closes themself off from outside influences will often be called "insular"
insular
characteristic of an isolated people; especially : being, having, or reflecting a narrow provincial viewpoint
Though this might sound ill fitting, their examples show how it fits your needs:
Examples of insular
the insular world of boarding schools
an insular community that is not receptive of new ideas, especially from outsiders
The best choice is discriminatory: Marked by or showing prejudice, bias.
Your organization treats people in a very discriminatory manner.
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+1. I'd accept this answer if I were the OP. Common service agreements would state that "discrimination" of any kind: including but not limited to religion, sex, race, ethnicity, gender, sexual orientation, culture, caste or creed is strictly prohibited. Commented Jan 14, 2016 at 11:44
Exclusionary sounds clumsy to me, and I would prefer to say that the group wasn't inclusive.
Answering your question from a broader perspective, though again this is not a good fit for the example sentence, a word that means that the group is not accepting of others could be simply clannish.
When considering various contexts for the above example, a possible word could be parochial.