The thing is, I think, anybody who wants an answer from ChatGPT can ask ChatGPT themselves - or just Google it and get the AI answer there. People ask questions on social media because they want answers from real people.
Replying to a Lemmy post with a ChatGPT generated answer is like replying with a link to a Google search page. It implies the question isn't worth discussing - that it's so simple the user should have asked ChatGPT instead of posting it. I agree with the OP - it's frankly a little insulting.