You cannot deny the anti-Israel attitudes of people central to the anti-apartheid movement, like Desmond Tutu, y”s. Also, why do you think so many whites, including Jews, had to leave South Africa once the ANC took control? Any South African Jew you would talk to will tell you that they had to leave because of the violence that Mandela and his cronies caused. If that was such a benevolent movement, than why did the USSR back it and America oppose it? The ANC is supported by its Tripartite Alliance with the South African Communist Party and COSATU, and the ANC is a member of the Socialist International. Under Mbeki, the ANC did make some concessions to capitalism, but the ANC is still marked by a leftist, anti-white, anti-colonial agenda.
The ANC, in December 2012, also voted in favor of BDS.
Mandela, when visiting Israel in 1999, came in a spirit of peace, but did acknowledge the fact that apartheid South Africa enjoyed good relations with Israel. (Recall that Arik Sharon in 1981 visited SA troops in Namibia and said that South Africa needed more weapons to fight Soviet influence).