Dear Queenie,
Someone I know makes fun of other people when they make mistakes, even though that person makes plenty of mistakes themself, sometimes the same ones they have made fun of in other people.
Queenie, why do they act this way? Don’t they realize how foolish they make themself look?—Disgusted
Dear Disgusted,
Some people who aware of their own shortcomings try to build up their self-esteem and (unsuccessfully) try to avoid feeling foolish by tearing other people down. They are bullies, plain and simple.