What is a hypocrite? Why is jack a hypocrite?

A hypocrite is someone who pretends to do one thing and does another..... let's say someone presents themselves as honest and respectable but turns out to be a manipulative cheat..... that person is a hypocrite.

Jack is a hypocrite because he makes comments about Auggie, who is supposed to be his friend, just to fit in with the kids who pick on him. A real friend would never poke fun at someone their supposed to care about, nor, would they hand out with people who do.