This is one of the most time-wasting aspects of fanon - some people become so attached to their expectations and assumptions that rather than being pleased when some aspect of a story surprises them or goes in an unexpected direction, they become protective of the assumption and in some cases invent some fairly closely-worked out rationalizations for why the writers were wrong to do what they did. I watched idiots do this with the later seasons of "Buffy," which was particularly sad because that series was so energetically off-kilter and counter-intuitive all along and would have been a lesser show without that quality.