Obvious troll is obvious
It’s like yelling at someone for being a complete waste of space. People say it when they know someone is just trying to ruin the fun.
You: Why do you keep posting nonsense? Them: Obvious troll is obvious.
In a Discord server: This person is the worst. Someone: Obvious troll is obvious.
DM from a friend: That guy’s a real piece of work. You: Obvious troll is obvious.