Come on folks, we need to use some simple reasoning here.
The USA has a white population of just a touch over 75%. Obviously that means 3 out of every 4 people are white! That fact alone would make many Christians Churches have a surface appearance of being “white” because at a bare minimum most of those Churches are populated by 75% (or more) white people. Yet, we know as an absolute fact that the Catholic Church is not a white Church; for example hispanics are heavily Catholic, and the USA has a large hispanic population.
Worldwide the non-white Catholic population soars. For example, there are 17-20,000,000 Catholics in India alone. Mexico is over 90% Catholic, African nations are becoming more Catholic all the time, etc.
Father’s complaint is clearly that he does not see, on the south side of Chicago, large populations of black Catholics, which of course is true, yet that does not mean the RCC is a white Church–that is where Father’s logic falls apart completely.