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Neither of these points is relevant to the situation. And to interpret a simple question about why one participant is accepted and another is not as a demand for the host to justify their decisions, and to claim that their dignity has been offended... that seems like an overreaction, I think it's better to be more straightforward.
They may not be relevant to the situation, but they show that the organizer is not obliged to explain their decisions to those who have nothing to do with it.