I realize this is a sweeping generalization and that there are AA's that do hike. In fact, I've met a couple gentlemen on the trail recently, but by and large they don't and I'm curious as to why that is?
I've hiked all over the US and Canada and have seen maybe a dozen AA hikers in the last twenty years.
Being out in the woods where anything can happen isn't desirable for me nor people I know... A lot of this has been passed down by relatives who grew up in the South and imparted horrific stories about lynchings and other bad outcomes when black people went into the woods or hiking.
My guess is just like why most women don't hike alone...safety...it might just be perceived, but I think it is a real fear that would hard to overcome...