The author was thinking "boring and uninteresting" but settled on the word "rude." No, it's not rude. Emailing your co-workers provactive political memes or telling someone to die in a fire is rude. Using ChatGPT to write and being obvious about it marks you as an uninteresting person who may not know what they are talking about.
On the other hand, emailing your prompt and the result you got can be instructive to others learning how to use LLMs (aren't we all?) We may learn effective prompt techniques or decide to switch to that LLM because of the quality of the answer.
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