i'll have to look up the studies, but they used names as well as voices.
you are letting on to things you look for when discriminating between a black voice and a white voice. the study used attitudes like yours to determine how to proceed.
as someone who spent all of his professional career talking to people on the phone in various capacities, i have no problem telling you that i could fairly accurately tell you not only the race of the person i was talking to, but very small details about them. hell, if i spent long enough on a phone with someone, i could register a good guess as to what is in their pockets or what was on their desk, much less the color of their skin.
does that make me racist? barely. that makes me aware. most people have this awareness. clearly, you do too. you like to pretend that you are colorblind, but your naming of certain factors that would lead you to suspect that someone is black paints a much different story.
in any case, the deck is stacked. and for you to pretend that it is not by attempting to portray me as a racist for acknowledging reality is weak.
weak as fuck.