You're seeking to establish false equivalency. You're right that fake news affects us all to varying degrees. OTOH, absorption of too much of it has established a complex of belief among right wingers that's basically delusional. Witness Trump as President.
Decades of concerted effort made that possible.
Why the effort? How can the effort have success? If there is some common root shared but perhaps unequally by conservatives and liberals, how should that be pointed out without raising the alarm of false equivalency? How do we check that the meme of false equivalency hasn't become a reflexive defense itself?
IGBT: "Is there any doubt that the Russians have infiltrated with liberal academia in all the US colleges and Universities and have succeeded and disrupted beyond their wildest dreams??"
And the result? One person trying politely to logically reason with him and another tagging him as one of the stupid victims, etc.
Notice no analysis of the validity of his point of view, to wit, why he holds it, why he expresses it, why he believes it, why he is indifferent both to reason or insult and so on.
Let's look at it from the point of view of morality, a belief not only that there is a good but that the good should be defended as well as the chaos and disaster to humanity that would be visited on us were we to cease to believe in the good. Remember that IGBT is a conservative and that conservatives have a much larger plate of moral concerns than liberals do and thus a greater range of issues they need to preserve and keep from collapsing for the common good, a possible reason one might not wish to dismissively ignore all of their concerns, maybe maybe? As liberals, it might just be possible, I postulate, that we may be blind here, OK?
So I want to suggest another radical idea here, that IGBT is motivated to take the stands that he does because he is a loyal, courageous and extremely dedicated member a very special and worthy (in his and perhaps your mind anyway) group of people called Americans and that he sees in your much narrower band of moral concerns great danger to the nation, including such so called liberal loves of communism and socialism and that he sees liberalism to go hand and hand with a university education. He is afraid that liberals will win and destroy the holy good that America represents to him.
You, on the other hand, fear that it is his kind of thinking that is a danger to the nation.
So what does that make the two of you if not patriots with different opinions. But you do not see him as a patriot nor does he see you that way. There is no trust but there is fear, the fear of the loss of the moral good and the greater the fear becomes the more mutually the hatred increases. Thus is lost the realization that we all want the same thing, the good to prevail.
This, of course, leads us to the question of what the good is, is there a good, why do we care if the good wins and in order to understand those things you have to have some real idea of what you feel and how you came to feel it.
I would suggest, therefore, that to seek to understand misinformation requires a psychological understanding of moral motivations, how we became attached to certain moral beliefs, what is our motivation and if for some reason known or unknown we might actually be motivated to look anywhere but there for the answers, condemning ourselves to endless holy wars.