He didn't have to say much, the answer to your question was very basic and obvious.

Take responsibility for your shortcomings, don't blame entire generations of people for it.

Does a hot air balloon go high enough to see the curvature of the Earth?
Also, don't be too hard on this guy, he realized his mistake.

That's a decent take, no argument here.

Glorious.

Ariel "should best" be played by a white person because she and her family are usually portrayed in a way that is best replicated by the skin tone and facial structure of white people (probably because Hans Christian Anderson was white), i.e. is obviously visibly (though obviously not racially) white.
vs.
Mulan "should best" be played by an Asian person because she is obviously visibly Asian.
.
Yeah, that's basically the same.
Also, my Grandma was a Cree woman, so I don't know whether you consider that to be "very, very, white", but I'm fine with it either way.

Yes.

The anger is understandable, but I wouldn't say its "substantiated", in that I don't think there's necessarily any injustice in a job position going away, and you don't really have a right to it anyway.
That's why I think that these guys fucking around with the lighting like that may well just be some amount of ass-pain.
This is obviously very dependent on what actually happened in this particular scenario. The bosses may well be twats after all.