My experience (cat owner myself, son of cat owners and regular cat-sitter) confirms what the article says: orange cats are no more or less prone to doing seemingly stupid/weird things than cats of any other color. More seriously, I think this stereotype is a direct continuation of stereotypes against red-haired humans (https://en.wikipedia.org/wiki/Discrimination_against_people_...), so it shouldn't be encouraged...
I think the association with discrimination against red haired humans is a stretch though
There is something different about them, and the red hair thing is a coincidence.