A person who gets pleasure out of hurting people online and starting conflicts is a troll.
Step-by-step explanation:
A troll is someone who posts inflammatory, off-topic, or offensive messages in online forums or discussion boards, often with the intent of causing disruption or starting conflicts. They often hide behind anonymity and use the internet as a tool to hurt people or cause trouble. They don't have the same goal as an advocate, who is someone who actively works to support a cause or policy, or a bystander, who is someone who is present during an event but doesn't take part in it. On the other hand, a positive digital citizen is someone who use digital technology responsibly and ethically, who respect other people's rights and privacy and is aware of the impact of their actions online.