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...
Tell that to my female Standard Issue Cats lol. One is food motivated, pretty intelligent when it comes to food and pretty fat, and her twin sister is routinely making me wonder if she's an orange cat with a modified fur. Dumb as rocks but excessively cute.
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.