We’ll both be high, the help don’t stare
They just walk by, they must don’t care

from Frank Ocean (Ft. Earl Sweatshirt) – Super Rich Kids Lyrics on Rap Genius

The maids/“help” have become accustomed, and uninterested to the antics of these rich kids. The maids that come around more than the parents stop caring after a while too.

“They must don’t care” is AAVE for “They obviously don’t care.” Oftentimes maids are not very well educated and so may not speak in correct grammar, Frank takes a stab at this here by imitating their speech for effect.

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