yeah I don't hold no respect for that nonsense either - it's one thing if you've sort of blurred certain headcanon/fanon into canon to the point where you can't quite pick them apart (character motivations are a place where I can see this happening - I've done it myself) .. but the situation you're describing sounds more like a case of "wishful thinking trying to make it so" or thinking that if a certain fanon thing is repeated often enough it will propogate through the fandom and become so pervasive that people will believe it's canon.