The Floor Scrapers —Gustave Caillebotte, 1875

As subject to the Salon Exhibition standards of 1875, this work was denied a place
and reassigned instead to the Impressionist Exhibition in 1876.
Impressionist paintings caused the French art world and, unsurprisingly, the upper class
to bristle, as the works tended to honestly portray the condition & quality of life
for the working class, as well as accurately depicting the private needs of the bourgeoisie and 
how those same needs had a detrimental effect on the proletariat.

Given all of the above, Impressionist painters were largely ignored at the time, their work remaining unsold, and all of it resulting in Impressionists struggling with their own livelihoods.
Caillebotte, who was wealthy, was also an Impressionist and understood the societal flaw in logic for what it was. Caillebotte prioritized supporting artists, and became a patron of other Impressionists by purchasing their work.