The trouble with all of the classic idealist arguments based on an appeal to the de facto priority of consciousness and its internal meaning making in any kind of knowledge or experience is that they rely upon the 'there-is-ness' of consciousness, requiring that it have the sort of being as what we only acknowledge for the legitimate furniture of 'reality'. This assumption already throws the argument in the opponent's favour. If you would get behind this objection then you have to surrender 'consciousness' and every other term that would ground an idealism - you have to give up idealism in favour of a sort of supra-idealism inexpressible in ordinary language.