You don’t have good grammar when you type with your fists.

The line is a wry warning about how anger and aggression degrade communication. “Typing with your fists” evokes both physical violence and the metaphorical “pounding” of a keyboard in rage—suggesting that when emotion takes over, clarity, nuance, and even basic correctness (“good grammar”) collapse. The quote also gestures toward civility in public discourse: persuasion depends on restraint and precision, while hostility produces noise rather than meaning. In that sense, “grammar” stands in for the broader discipline of language—syntax, tone, and reasoned argument—implying that self-control is a prerequisite for being understood and for understanding others.