Lord knows I should stay out of this, but...
I personally don't think Oak comes out of here looking great. He already wasn't able to begin on time due to reasons that are murky at best, but if your so called friends go on and on tweeting and stirring up stuff for the drama of it all, you certainly don't look good. Guilty by association, as they say. The same thing happened when Sting joined The Last Ship and with Brittain herself, so methinks the reason for such a different public reaction is all the tweets. Twitter does have power - power enough to make Mandy weary of coming in when controversy is swirling and put his foot on the breaks. Also, since "optics" is such a buzzword now, I think the optics of Oak not telling his friend to STFU just reflects badly on him.
Also, it's dumb of the producers to talk about how Oak feels. Who gives a flying fvck? They have a fiduciary responsibility to their investors to make back as much money as possible - and Mandy was the answer. Sorry Oak, but money talks. And if all those whining Twitter fans actually bothered to buy tickets, maybe he would have had a longer run.
Similar to GeorgeandDot, I too have been in situations with actors that seem to eerily echo this one. I think she's just reading between the lines - now, I'm not going to parade it as fact, but it seems the most likely explanation. And as they say - the simplest explanation is usually right.
As for yelling "racist" at anyone who takes this view, it grows old fact. It seems very likely Oak had something to do with this outburst on public media (obviously, he is merely passive aggressive in his own announcement, the bulk of his feeling taken care of by his friends), and this situation it so extraordinarily unclear, well... why not focus on actual problems rather then blindly yelling "Racist" on message boards, which is tedious and, frankly, sophomoric.
"Sticks and stones, sister. Here, have a Valium." - Patti LuPone, a Memoir