There are 3 kinds of trolls in the world. The internet trolls, the gaming trolls, and the real life trolls. Internet trolls are the most entertaining. They either suck, or good at trolling. Usually they just fuck with some random person. Think of it as bullying in the internet. Only its actually funny. just don't take it seriouslyand at some point they'll stop.
Gaming trolls are less entertaining. They usually consist of 10 year old kids with voices that make you want to choke a bunny. They're usually found in CoD games, usually targeting people who are "tryhards", or people who just suck. Just ignore them, and and things will be fine. Chances are you will never see them again anyways.
The real life trolls are the worst. They give no amusement at all. They can be identified as a person who is wearing some kind of clothing involving an internet meme. They usually say things that internet trolls would say. Only its put into speech. And trust me, if you hang out with them for about 2 minutes, you will most likely punch them in the face. These people are also classified as "absolute douchebags". Don't make eye contact, or any other kind of contact, and nothing will happen.