I believe as an American, I have the right to self-identify! Therefore, if I desire to be called African-American, not to say I am from Africa but to recognize my African heritage-why would anyone have an issue with this? I identify as African-American because when we as a race allow others to identify us we get called: N-word, colored, criminal, thug, angry, and other heinous names! A-A allows me to reclaim the dignity of our shared past and acknowledges my connection to the birth of humanity, civilization, and science/math. Referring to Giannis and other foreigners as A-A is most likely just people going on what they see and not thinking it through so it is not relevant!
BTW: 1. it is interesting how many insignificant issues people find to distract them from the important issue of treating everyone as if they have value! 2. It is condescending to attempt to tell an entire race what they should call themselves and should be avoided at all costs!