[BoxFour]

I think you're over-estimating how much some people care.

I have had coworkers say "Oh I don't know, Claude added that" in response to questions like that without even a hint of shame or self-reflection.

[Gigachad]

Sure, some people have no self awareness. In that case you can change your approach, if you are a manager or otherwise invested in the company you can put pressure on them to increase the quality of their work and to own the things they submit. Bring up specific examples of poor quality work, errors in documents/messages, etc.

Or if you don't care you can just ignore this persons messages.