What does tolson means when he say, “black is always equated with failure”

Words meaning failure are connected to the words meaning black--he is explaining how even the language is set to expect failure from blacks. 

This quote is from Great Debaters and Tolson is speaking to the students that didn't make the debate team. He lists words meaning failure that have a root word connected to the word "Negro". He follows by stating they should make their own dictionary--meaning they need to not let expectations stop them from being successful. 

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.