Don't forget Wittgenstein may have reacted as he did out his own emotional attachment as well.

"Who you to say your monkey tribe so much better than mine!"

Agreed. Or from e.g. feeling betrayed that Malcolm didn't consider him and Wittgenstein to belong in the same monkey tribe for all intends and purposes. I've not read any of Wittgenstein, but if he was of internationalist ideology, he might have been disappointed to see nationalist sentiment in Malcolm (which would put Malcolm and Wittgenstein in different tribes) rather than whatever ideological/political/racial/religious/class distinctions would have put them in the same tribe.

I don't make the same tribal distinctions that a Greek nationalist would make, or a white nationalist would make. For someone to put much weight on such distinctions would mark him as a different tribe according to my distinctions, even though I'm Greek and white too.