Wasn't Pat worse than what Al Jolson did? Seems to me Pat was an intentional effort at encouraging the audience to feel revulsion and engage in mockery against a kind of person who is an outsider.
From the Wikipedia article, "Al Jolson":
Jolson often performed in blackface makeup. Performing in blackface makeup was a theatrical convention of many entertainers at the beginning of the 20th century, having its origin in the minstrel show. According to film historian Eric Lott:
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