They need to be challenged with this:
“either call him(me) a racist and defend the accusation or apologize immediately for insinuating it”
They can’t be allowed to get away with these insinuations that are intended to silence dissent.
And if they refuse your answer to their insinuations what then? We may be beyond the point of “debate,” “discussion,” and holding “different points of view.” We may have reached the point of active suppression. We may have reached the point of excluding and/or excreting these wretches? We may have reached the point where we become a People again and those who do not belong must be quiet and keep their poison to themselves.