It seems strange to you? It's natural to how I write - intentionally avoiding politeness would be weirder to me.

But aside from that, an LLM is only a roleplayer. Treat it like an idiot that makes mistakes and it will act like one. Treat it like a coworker who you respect and it will act like one, and it will find better results.

Obviously nothing about how they act is set in stone but as a general rule this seems to me to be both wise and, in my experience, true as well.