The only law that acatually discriminates against minorities is the one saying CofE churches cannot conduct same sex marriages and gay employees who have been ordained cannot get married.. There are laws discriminating against all kinds of minorities in all sorts of places round the world. Even including the death penalty. Harry Forest appeared to be saying that such laws should never be defied.
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I can't see how aken can reasonably be criticised for pointing out that the claim that marriage should be available for all people who love each other, unless it is qualified, does in fact imply that incestuous marriage should be legal. That isn't saying that people making that claim intend that, but it does imply they should be more careful to say what they actually mean.