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 oth…
There is an alternative interpretation - "the LLM put it so much better than I ever could, so I copied and pasted that" - but precisely because of the ambiguity, you don't want to be sneaky about it. If you want me to have a look at what the LLM said, make it clear.
A meta-consideration here is that there is just an asymmetry of effort when I'm trying to formulate arguments "manually" and you're using an LLM to debate them. On some level, it might be fair game. On another, it's pretty short-sighted: the end game is that we both use LLMs that endlessly debate each other while drifting off into the absurd.