Because it’s wrong.
Why? Just because it looks funny does not make it 'wrong.' That NC district was designed specifically to ensure a black could be elected and it makes the neighboring districts much more competitive for the Republicans.
You can look up the district here. http://www.ncga.state.nc.us/GIS/RandR07/District_Plans/Congress/Congress_ZeroDeviation/2003/Reports/IndivDistrictByPrecinct/RegPR_PDF/rptVTDRegPR12.pdf
It's 45% Black and 58% Democrat only 26% Republican. Back about 10 years ago, The Supreme Court upheld the district by pretending it's lines were drawn for political rather than racial reasons. It's legal.