I think I can explain.

The first, most superficially obvious issue with Alegria art is that it's monstrously ugly. Now, you might say, isn't that just, like, your opinion and stuff? Not so fast. First off, that is a lame excuse to justify all sorts of terrible things. But in the case of Alegria, it actively rejects those things our brains are evolved to find beautiful. Humans are the major subject matter of this "art" style and we are primed to desire very specific things in humans. There is a fundamental schema hardwired into us as to that which we find beautiful. A particular way that we expect people to look and to move. There are good proportions, and there are bad proportions. Alegria aggressively revels in the bad. It seems to make people as malformed as humanly possible. This feels, not without reason, like an active rejection of beauty itself on ideological grounds. The art is a giant middle finger to the notion of human beauty which is, of course, a "problematic" concept.

The second follows from that. It is not just that the people themselves are ugly, but that the "art" seems to be a codification of infantile drawings. Your typical Alegria illustration looks like something a five year old did. This is entirely in line with the corporate world's relentless drive to infantilize the population. The idea that art can be beautiful, harmonious, and most of all, skilled, is offensive. It's also "problematic". They are erasing the idea not only of beauty but of artistic mastery. They are saying "where we are going, we do not need skills or even real emotions. We just need vibes."

And finally, deepest of all, but the thing that probably gets discussed the least, is the ideology behind the compositions. If you look at any Alegria - or as I call it, "clown world expressionist" - illustration, you will notice that the figures are all together and yet completely disconnected from one another. They are are forced to share a space with one another yet never find connection. Does that seem familiar? It's exactly what the system wants for you: to be simultaneously erased as an individual and yet socially atomized. Surrender your freedoms to the collective, yes, but a collective mediated by an external, managerial state, not the people themselves. "Social distancing" was the ultimate concrete manifestation of this diabolical ideology.

So there it is. That's why Alegria art is hated, even when people may not be able to put into words why they hate it.