The reason Art Nouveau is in the ‘depressed thot’ category isn’t that the art looks ‘depressing’ (although I think there’s a quiet melancholy in a lot of the works), it has to do with the ideals and the ethos of the movement.
Art Nouveau was a tumultuous movement which formed parallel to the Decadent Movement, the Arts and Crafts Movement, Post-Impressionism, and Symbolism. It experienced an incredibly short life expectancy, perhaps owing to the contradictory nature of the movement.
Like the Arts and Crafts Movement, Art Nouveau viewed rapid industrialization, the degradation of craft, the increasing standardization of daily life with skepticism - but unlike the Arts and Crafts Movement, it didn’t spurn new technologies - it just rejected functionality as the prime aesthetic principle. At the same time however, Art Nouveau embraced a sort of Pre-Raphaelite belief in the infallibility of nature. The curvature of nature, the flowing of vines, the expansion of branches - all of these things were considered ethereal beauty to the Nouveau artist.
Which is why one of the most common portrayals for Art Nouveau artists was the young, skinny female. Her body is natural and flowing; and her poses and facial expressions show sensuality and ambiguity. There’s a certain aura to these paintings - like a melancholic sexual tension - the feeling of grasping at something but being unable to attain it.
And thats symbolic of what Art Nouveau was. It stood at the precipice of modernism without fully committing to it. It aimed for beauty in a way that was, deep down, wrought with tension and contradiction. It’s why most of its apprentices (Picasso for example), ended up spurning Art Nouveau for more intellectually stable modernist movements. And its why I considered it both ‘thot’ and ‘depressive’.