The White ethnic groups that settled in the Northeast and Mid-Atlantic region have a very turbulent history with African-Americans. Irish, Italian, Polish, Ukrainian, Lithuanian, etc., immigrants often clashed with African-Americans in major urban areas like Chicago, New York City, Boston, Philadelphia, Cleveland, Detroit, etc. They assumed the identity of “Whiteness” and everything that went along with that, including racism and discrimination against African-Americans.
This is history is well documented in films, books, plays, etc. The Rev. Dr. Martin Luther King, Jr. said the violence and hatred he encountered in Chicago was worse than the South. South Boston is notorious for racial violence and hatred towards African-Americans, especially in the 70s. South Boston is predominantly Irish-Catholic. Bensonhurst in Brooklyn, a predominantly Italian-Catholic area experienced racial unrest, after the murder of a young, African-American teen in the 80s. African-American filmmaker, Spike Lee’s early films deal with tension between Italian-Americans and African-Americans in New York City. When I was fifteen, there was a housing discrimination case involving a Ukrainian-Catholic family and an African-American family in Cleveland. Cicero in Chicago was infamous for racial violence.
This is not to say that all White Catholic ethnic groups actively oppress African-Americans, are racist, or support White Supremacy, but many do and this is why some African-Americans don’t like Catholicism. There are other reasons of course, but racism at the hands of Catholics is a huge factor in disdain for Catholicism. There’s also the perception that Catholics worship idols, especially Mary, pray to the dead, etc. I was asked point blank when I came into the Church if I was now going to “worship statues”.
https://www.amazon.com/Whiteness-Different-Color-European-Immigrants/dp/0674951913