I guess this is all about rudeness from being too lazy.

My understanding is 'lmgtfy' is a response to a lazy request for help. Someone's asking for help, but it seems like they could have helped themselves if they just searched Google. -- The corrective action is: it would have been better if the person asking the question had demonstrated thought/effort about their response.

Whereas "don't paste AI slop", merely copy-pasting an LLM's output is lazy. (The asker could have asked an LLM). -- The corrective action is: the response should show more thought/effort.