Having done a lot of work in homes for people through the years I have this conclusion based on personal experience. People can live like total slobs and pigs regardless of race, income or their placing on the social ladder. Some of the richer people just have a bigger and better quality of shit piled up all over the homes.
The nastiest people I have ever had to work for were from India. Fuckers had a god damn bird living in their kitchen base cabinetry. Fucking bird seed and bird shit all over. Same house upstairs access panel for the tub faucet, I pulled the cover off to check for a leak and a god damn RACOON is inside of it all pissed off and looking back at me. Slammed the cover back on, held it with my feet, screwed it down tight and got the fuck out of there.