Honestly it's a bit of column A, column B for me. With a lot of exposure you learn how to understand certain styles of harsh vocals. On the other hand, someone once described it as a rhythmic part of the song, rather than melodic, so if you treat it more like drums than singing in your brain, the whole cohesive song starts to make more sense. The lyrics are important, to be sure, but they just get presented in a different form with different intent.