But is this actually a personal attack or pointing out a fact and providing an opportunity for introspection?
He declared, unsourced and uncited, that Winston Churchill thought that people with "brown skin" were "subhuman savages." He then declared that because Churchill had these supposed opinions, he was not worthy of any human decency, that he was in effect a subhuman.
Furthermore, he declared that anyone who had any issue with that assessment had a share by contagion of Churchill's unpersoning. That's not civilized or cultured. There is a word for that.
A core trait of civilization is that members are entitled to the rights of citizens, which almost categorically include equal protection under the law and in the West a recognition of a shared humanity even among those that aren't citizens.
More explicitly, this is a trait of Christian civilizations. Churchill, who did believe in a developmental hierarchy, also believed that Anglo-Saxons were superior to other peoples because they had this categorical understanding of human value.
If someone arbitrarily rejects this core aspect of civilization (i.e. lacking in it), attempts to dehumanize those who do have it in a combative and dismissive manner is by definition a savage.
If pointing out that words mean things results in warnings and threats of bans, then I don't want to be a part of your circus anyway. I hope your city and industry meet the fate it deserves.