Griefing is the act of irritating and angering people in video games through the use of destruction, construction, or social engineering. Popularized in Minecraft by teams, griefing has become a serious problem for server administrators who wish to foster building and protect builders. Most players tend to dislike and frown upon griefing, while others feel it adds a certain degree of drama to the game.
https://minecraft.gamepedia.com/Tutorials/Griefing
A griefer or bad faith player is a player in a multiplayer video game who deliberately irritates and harasses other players within the game (trolling), using aspects of the game in unintended ways.[1] A griefer derives pleasure primarily or exclusively from the act of annoying other users, and as such is a particular nuisance in online gaming communities, since griefers often cannot be deterred by penalties related to in-game goals.[2] This creates a strong division between griefing and cheating, since cheating is done with intent of winning the game and thus is discouraged by in-game penalties.
https://en.wikipedia.org/wiki/Griefer