It is politically charged, and often used in a denigrating manner. (Not proper English, stupid, improper, etc)

At least it was back in the day. I don’t think many people use the term currently. Most linguists and black people would use AAVE instead. Ebonics is actually short for “Ebony phonetics” which is gross

For some history on how the term got so charged:

https://en.m.wikipedia.org/wiki/African-American_Vernacular_English_and_education#Oakland_Ebonics_resolution