Bernardine Evaristo called out the BBC for a news item which referred to the Booker Prize as being shared between Margaret Atwood and "another author". For her book Girl, Woman, Other, Evaristo is the first black woman to win the prestigious award. The BBC has since apologised.
Vogue Brazil's magazine cover highlighting the Rio Paralympic Games left a sour note across social media as they photoshopped models to look disabled
If not the complete answer, science gives us significant clues as to why we like to shame people online and outrage about issues.