I read the Chael article some are referring to as the hit piece, and was too late to participate in the discussion but diving right in: some here assert that Chael's tweet mentioning Ed Soares' "piglet tribe of savages" is not racist, but xenophobic. Let's examine this logically.
Xenophobic is defined as "afraid of foreigners". Since Ed Soares is an American citizen, this point alone is strong enough to say the quote is not xenophobic, unless Chael thought Ed was a foreigner, which I think is unlikely given Ed's stature in the industry and how long Chael must have been aware of him.
Now, with Ed being an American, what is Chael actually criticising when he talks about a "piglet tribe"? A tribe, in typical usage, refers to a usually racially homogeneous, relatively small community. Most communities described as "tribes" tend to be non-white - African tribes, American Indian tribes. When Chael criticises Ed's tribe, he's belittling people of Brazilian descent. This is where people usually say "Brazilian isn't a race, so it's not racist". Well, it actually is. Chael is being racist against the racial components of Brazilian which are non white. It's entirely possible to be racist against groups of mixed race. E.g. treatment of mulattos; the insults "halfbreed" or "mongrel". Chael, being white, is being negative about the (from the racist's perspective) "impure" nature of the Brazilians as a group - as they are a blend of white and many non-white origins.
As to whether Chael himself is racist, I have no idea. I'm just dissecting the quote and its context.