It seems that we have a troll.
https://en.wikipedia.org/wiki/Internet_troll
In Internet slang, a troll (/troʊl, trɒl/) is a person who starts quarrels or upsets people on the Internet to distract and sow discord by posting inflammatory and digressive, extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the intent of provoking readers ...