Gamesplaining

When a player with less game knowledge tries to explain how to play the game to the player who has more game knowledge.
Following events may occur as:

Gamesplaining person failing at the game right after gamespalining.
Gamesplaining person may sabotage your game, because you did something right.

Gamesplaining person may be toxic in a group chat trying to force everyone go against you.
Gamesplaining person may leave the game AKA AFK to ruin the game feeling for the rest of the team.

A low Elo player is gamesplaining higher Elo player of how to play the game.

A toxic player tries to gamesplaine people how to play the game.