So when Nellie Newmember, who writes scholarly nonfiction, gets a gander at the written version of the group's bylaws, she decides she might want to look elsewhere for a support group. Second, bylaws define membership, that is, who can join the group. Yes, and for good reason. There's a subtlety here that may need explanation. Membership requirements are exclusionary, but not necessarily discriminatory.
Discrimination is based on personal bias.
Exclusion, in this case, is based on adherence to written membership rules that describe qualifications based on interest and avocation. In short, people with common interests and goals. This is absolutely nonnegotiable, and results from requirements of Texas Non-Profit Law. Since deregulation, there are very few areas of bylaws that national reserves the right to influence. Membership classifications and requirements is one of them.