The phrase "obvious troll" refers to someone who makes deliberately provocative or offensive comments online, typically just to provoke a reaction or argument from others. Full definition
You support the professionalism and are open to discussions with anyone, even obvious trolls and nasty responders. (judithcurry.com)
Incredibly obvious trolls too, some of them are even saying they're only rating it 0/10 because they're Sony fanboys who want Horizon to be seen as GOTY. (gonintendo.com)
Donaald is one of the more obvious trolls and all you really need to do is just click on his avatar and look at his comments. (nintendotoday.com)