No, to them. I was thinking specifically of the Rwandan Genocide[0], where there was and is no visible difference between the Hutu and Tutsi. The difference was via a field on their national id card [1].
0 - https://en.wikipedia.org/wiki/Rwandan_genocide
1 - http://www.preventgenocide.org/edu/pastgenocides/rwanda/inda...
Taller men tend to earn more money on average so in those terms both the average Tutsi, Hutu and outsiders should be able to make a better than random guess about who is Tutsi or Hutu.
"Prior to the arrival of colonists, Rwanda had been ruled by a Tutsi-dominated monarchy since the 15th century."
"Rwanda was ruled as a colony by Germany (from 1897 to 1916) and by Belgium (from 1922 to 1961). Both the Tutsi and Hutu had been the traditional governing elite, but both colonial powers allowed only the Tutsi to be educated and to participate in the colonial government. Such discriminatory policies engendered resentment."
"When the Belgians took over, they believed it could be better governed if they continued to identify the different populations. In the 1920s, they required people to identify with a particular ethnic group and classified them accordingly in censuses."
To you. There's almost certainly more genetic difference between two people randomly selected from two African tribes than two people randomly selected from different self-identified racial groupings in a Western country. And a much longer history of conflict between tribes vs races. I'd note the fact this is true goes a long way towards explaining why Africa suffers the levels of violence and poverty today that it still does. As for the rest of your past, while AA clearly is strong form of racial discrimination that does little to help us achieve an ideal world where "race" is no longer a thing, it's also a policy with an underlying philosophy of "let's provide help to other people different in appearance/ethnic backgrounds" , which is rather obviously a massive improvement on "let's actively discriminate and/or commit violence against such people". And hopefully a step towards a policy of "let's help other people when they need help, regardless of their appearance or ethnic background".