Obvious troll is obvious
This phrase is for people who think they're the best at being a pain. It's used when someone’s being a total nuisance on the internet.
You: Why are you being so rude? Them: Obvious troll is obvious.
In a game chat: This person’s a menace. Someone: Obvious troll is obvious.
In a tweet: Can’t stand this guy. Reply: Obvious troll is obvious.