Well, this is one of the more absurd threads I've come across.
You are the only Nintendo fan that I recall stating that Mario Kart 8 is graphically disappointing, and far, far from "many" Nintendo fans suddenly think that art style comes second to graphics. If what you are saying were true, there would be more people like you who compared Mario Kart 8 to titles like Drive Club and then used the comparison's results as an argument for why Nintendo should focus less on art style and more on graphics. Yet here we are, and no such threads can be found while your thread is the only one to ever do this comparison.
A few hypocritical forum users that you've come across won't change this, and is never a good basis to judge an entire fan base on.