Hi Monica and Christy, I think you are both more on the same page than otherwise.
Sure, it’d make sense for companies and individuals who support LGBTQ groups to display their alignments with customers and employees. But, as Christy said, for whatever reason that may not be practical or desirable for the supporters. In fact I happen to know that the local HRC groups are not provided with names and contact info of local members for that very reason: they might worry about being out-ed. Christy’s correct that the organization is free to offer decals and so forth but it’s certainly okay for a supporter to decline.