INTERNET TROLLS:
(excerpt)
An
Internet troll is a member of an online social community who deliberately tries to disrupt, attack, offend or generally cause trouble within the community by posting certain comments, photos, videos, GIFs or some other form of online content.
You can find trolls all over the Internet — on message boards, in your YouTube video comments, on Facebook, on
dating sites, in blog comment sections, and everywhere else that has an open area where people can freely post to express their thoughts and opinions. Controlling them can be difficult when there are a lot of community members, but the most common ways to get rid of them include either
banning/blocking individual user accounts (and sometimes
IP addresses altogether),
reporting them to authorities, or closing off comment sections entirely from a blog post, video page or topic thread.
(found here)
10 Types of Internet Trolls You'll Meet Online
Read, be educated, take a deep breath and try to not belittle others here.