To prejudice people and things it is a bad habit that the human being has. We easily say of others that they are posh or “gypsyish” for the type of clothes that they wear. We say, men are cheaters, liars and womanizers. We say, women are bossy when they have more aspirations than to be married and to breed children… And we say sloths are silly, lazy, stupid and dingy. Ok you are right… maybe to let your whole fur to be covered with algae and fungi it is not the “best hygienic style” but it is the best for camouflage.
The facts are that it seems this animals use to move in slow motion because it is the better way to blend in the forest and, of course, which is the better way to match the jungle tones? To rock green hair with style! Do not say it is not cute, maybe smelly but cute for sure. You can read more facts in this piece by BBC Earth. Discover the unhurried world of the sloths.