During the days of apartheid, it definitely would've been. But I believe they were friends then.
And what exactly is South Africa occupying at the moment?
That was the past and it cannot be compared with what Israel is doing in the present. Modern South Africa is let by its own people, there's in no occupying whatsoever. So no, that is not hypocritical.
Weren't they one of Israel's major weapons sources for decades?