Calling Israel "Apartheid" is Insulting to Black South Africans

I am from Zimbabwe and grew up under the strictest regime of apartheid in South Africa. Today, I am an author and law student at University of the Witwatersrand in Johannesburg, South Africa. I am an avid debater, ranked fourth globally and first in Africa in the World Universities Public Speaking Championship.
I have read the recent guest column in The Oregonian written by Alice Rothchild.
I understand that the Methodist and, later, the Presbyterian Church USA are considering proposals to boycott and divest from Israel.