ergo decedo (Latin for "therefore leave" or "then go off"), short for argumentum ergo decedo, or The Traitorous Critic Fallacy as it's referred to, means responding to criticism by attacking a person's perceived affiliation as the underlying reason for the criticism rather than addressing the criticism itself. The critic is assumed an ungrateful traitor, and thus they should stay away from the issue altogether.
Critic: "I think we need to work on improving United States' taxation system. The current system suffers from multiple issues that have been resolved in other places such as Canada and Europe."
Respondent: "Well, if you don't like it, why don't you just leave and go somewhere you think is better?"
Critic: "Russia's political atmosphere is unsuitable for starting constructive conversations about reforms for the future of the country. A number of improvements is needed."
Respondent: "Well, if you don't like the political system, then why are you here? You should just leave!"
- M. Copi, Irving (2010). Introduction to Logic (14th Edition).
- Taylor, Charles (1997). Philosophical Arguments. Harvard University Press.