I think there really is a lot of prejudice against 3D art.
And it’s for a lot of reasons, but a lot because really good 3D is super over used in tv and movies (special effects not the glasses type 3D), so people become to blase. And also there is the uncanny valley effect where if things you know are fake look too real, it turns people off.
A similar thing is seen with high def TV and 3D TV/Movies (glasses) hyper realism can turn people off very quick.
Plus there is some bias in that people don’t really know how much effort goes into any particular piece of art. In many cases traditional paint/sketch (non computer) art can be much much faster to do than 2D or 3D computer art. But it is almost always seen as “better” or “real art”