How a board can dictate something like this is beyond me...it should be upto individual choice and noone should have the right to question one's beliefs.
I agree with you in principle. However, I think with it being South Africa where race has been so central to their history, it is as you can imagine a very sensitive matter. Maybe he should have tried to work it out with the board and find another way to express support that was acceptable to everyone.
Until he gives his side we cant really be sure.