Why are some people content living in filthy homes?

I never understood this, but when I go to my friends house as I don't want to go inside because it's filthy, 3 dogs and 1 cat jumping all over the place. He has 2 kids and a wife and they have their computers setup in the living room etc... Blinds are always down you never see the sun in their main living room. I have often wondered how can people stand for living in such filthy conditions as I don't know their socialist views are probably tuned to it maybe?

Some times I have him over for a visit but my house is clean compared to his.

I just never understood this, why are some human's happy living in their own shit?

Why are some people content living in filthy homes?
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