A brahmin is supposed to be sattva guna , the sudhra tamas guna according to own admission a brahmin is superior to a sudhra
Sattva means pure.
Sattva guna indicates a nature that is divine, pure, and spiritual. A sattvic leads a chaste life, eats moderately, using precise language and speaking only the truth. A sattvic speaks compliments and avoids vulgar or insulting language, is never jealous, and is unaffected by greed and selfishness.
Tamas means darkness.
Tamas guna indicates a nature that is lazy, ignorant and destructive.
Rajas means energy.
Rajas guna indicates a nature that is energetic, passionate, evolving and with zest for life.
Every Human has these three guna's in varying degree. A person in whom the Sattva guna is predominant is called a Brahmin. A person in whom the Tamas guna is dominant is called a shudra.
So yes ......a Brahmin then becomes superior to a Sudhra.
An educated, soft spoken, cultured, honest and charitable person is always superior to a person who is a liar, greedy, lazy, and who has criminal tendencies.
The three primary gods of Hinduism is also linked to the three gunas. Brahma is sattvic, Vishnu is Rajas and Shiva is lord of Tamas. Hence the word 'Brahmin' from the sattvic nature of Brahma.