I grew up in a 99.9% African American JW enviornment and my experience is total shunning. Now my family - they shun as long as they can make you feel guilty and have a chance to bring you back, once they see that it won't work they come around.
Example: JW brothers (both elders now) have been df'd multiple times and every time shunning was enforced!
Me (not da'd or df'd just left), my older brother (da'd), older sister(df'd) and younger sister(never baptised) - no way were we coming back and made it known. They tried to shun but when we didn't give a damn and shunned them back or told them were to put their shunning, they changed their tune.
I sometimes wish they would shun me though
nj