I think that's a bit unfair. You can still be a fan of his old material and not dig his new stuff. To be fair, he did stretch his involvement to different genre's so people who love his old stuff find themselves to be scraping for goods, unlike us who have an open mind.
I know people who love "Old Usher" but whenever a "Climax" or "Hey Daddy" comes out, they are all into it again. I guess they wouldn't be called pure stans but it doesn't mean they cannot voice their opinion.
But I totally agree, some people take it way too far, especially on YouTube or those blog sites with no moderation. However I think the majority of it is fueled by haters and stans of other artists trying to downplay him.