The names list hasn't been clearly established as racist. If you have 10 times the European names as you have Asian names, is it racist against Asians, or were there "funny" names in all groups?
The perception of racism is not necessarily racism. That is precisely the point that is being argued. The claim of white supremacy does not mean that an organization is white supremacist. Big claims need big evidence. I haven't seen it.
Minor slights happen. They are inevitable in daily life no matter what your race, gender, sexual orientation or other identity. If you use minor slights to create an uproar in the context of your job, you are a bad employee who should be fired. Tying minor slights to genocide is one way of creating an uproar.
Singer had power and seniority at Basecamp. He once linked to a Breitbart page. While I differ with Breitbart on most issues, I do not see that as prima facie evidence that Singer is white supremacist or racist.
Just because Singer is a white male with authority does not make him, by definition, a white supremacist or a racist.
And if the only cure for that kind of "white supremacy" is replacing all the white males with any power or authority with people of other identities, then I'm opposed to that "cure," because it is a racist and discriminatory cure based on false generalizations about genders and racial groups.