FACT: All four of the main male characters are Caucasians.

I think Indians have Veddoid and/or Australoid admixture, or at least the brown ones like Koothrappali. So they're not 'purely' Caucasian.

United States v. Bhagat Singh Thind, 261 U.S. 204 (1923), was a case in which the Supreme Court of the United States decided that Bhagat Singh Thind, an Indian Sikh man who identified himself as an Aryan, was ineligible for naturalized citizenship in the United States.[1] In 1919, Thind filed a petition for naturalization under the Naturalization Act of 1906 which allowed only "free white persons" and "aliens of African nativity and persons of African descent" to become United States citizens by naturalization.

"Prove me wrong."

Explain wtf you're talking about properly first.