If you see someone being bullied, you can stand up to this injustice by telling the bully to stop. If the bully doesn't stop, you can help the person being bullied out of the situation by walking them to somewhere safe or finding an authority figure who can stop the bullying behavior.
Speaking out against everyday injustices takes courage and can be difficult at first. If it's something really care about though, you will feel better for not keeping silent when it comes up.
