From my arts background, I’d say it’s because you just about mix any colours together and it really doesn’t take long before you end up with brown. Brown being a tertiary colour, which you get from mixing at least three primary colours together (of course dirt is made up of many components)
Thinking on it more, dirt is usually made from plant matter, which is already brown (bark, wood), or green/yellow/red (mix any of these colours and the pigment looks some shade of brown!), As well as minerals like silicone (white- wouldn’t effect the hue of dirt only the tint), or granite, iron, nickel, so on.. which if you think about most are greyish or reddish colours.
So again it depends on the composition of the dirt but it does come down to the fact most of these colours mixed up just end up brown.
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