Anti-Protestantism is when people or groups discriminate against people who practice Protestantism, who are members of Protestant religious denominations. That means that they treat people who are Protestant differently, often in negative or unfair ways, just because they are Protestant. For example, people who are anti-Protestant might not want to be friends with someone who is Protestant, might insult them or make fun of them. They might even prevent them from going to certain places or getting certain jobs just because of their religion. It's not okay for people to do this—everyone deserves to be treated with respect and kindness no matter what their faith is.