lmgtfy was (from what I saw) always used as a snarky way to tell someone to do a little work on their own before asking someone else to do it for them.

I have seen people use "here's what chatGPT" said almost exclusively unironically, as if anyone else wants humans behaving like agents for chatbots in the middle of other people's discussion threads. That is to say, they offer no opinion or critical thought of their own, they just jump into a conversation with a wall of text.