Boston Mayor Michelle Wu has defended her decision not to invite white people to a Christmas party. The 38-year-old, who was elected to run the Puritan City in 2021, swatted away her critics just hours before hosting the controversial gathering inside the city’s official reception hall Wednesday. Wu conceded it was a mistake that every member of the Boston City Council received an invitation. She had already spoken to those who were not intended to attend the event. Wu said: “We had individual conversations with everyone so people understand that it was truly just an honest mistake that went o…