The avant garde has always been opposed to bourgeois values and norms. Every movement that has been tied to the avant garde has had to do with experimentation, individualism, and breaks from the norm. Bourgeois values have represented the upper-middle class ideologies that had to do with wealth and tradition since time began. Art has always been a way for artists to express the way they feel without words.
Some art represents views on society and some symbolizes culture.
It doesn't matter where it's from or what it represents, there is at least one piece of art out there that appeals to every personality on this earth. Most of the art that was produced by the avant garde in opposition to the bourgeoisie has appealed to someone in that class. The irony is that the avant garde was constantly changing in order to oppose the bourgeoisie but at the same time it appealed to the society it affected and the bourgeoisie was a small part of this. Therefore, the avant garde indirectly appealed to the very class it opposed. The main intention of art is to get the artist's point across without the expression of words.