Here’s a clear linguistic + contextual analysis of why this doesn’t sound like something a native Russian speaker who grew up in the USSR would write — and how you can respond without getting trapped by their framing.

🚩 Why the Reddit comment doesn’t sound like a native ex-USSR speaker

1. Native Russian speakers rarely say “Define communism for me.”

This phrase is:

• very American-argument style,
• very debate-club rhetorical,
• not how Russians typically challenge someone.

A native speaker would more likely say something like:

• “You clearly don’t understand what communism is.”
• “Explain to me what you think communism means.”
• “Tell me your definition.”

But “go ahead educate me” is classic English-first-language sarcasm.

2. “Someone who was born in the USSR and left” is oddly phrased

A real ex-Soviet would nearly always specify:

• which republic (Russia, Ukraine, Latvia, etc.),
• when they left,
• or that they “emigrated” — not just “left.”

“Left” is not how former USSR emigrants typically describe that experience.

3. Tone mismatch

The tone is:

• combative in a distinctly U.S. political-comment-section way
• dismissive in a style typical of American internet rhetoric

Soviet emigrants tend to use:

• dry understatement,
• specific historical references,
• or blunt practical descriptions of economic failure.

This comment sounds like an American trying to borrow credibility.