The "who cares" was directed at being asked the question if they would like a few knots added and getting agitated for being asked the question. I'm all for flying as precisely as is practical. Splitting hairs over 2 or 3 knots fast is going overboard (in the context of adding to Vapp if your LDA isn't limiting) again in my opinion only.
I hardly think It speaks to any kind of unprofessionalism, or lack of knowledge either. I would consider it being assertive and doing your job properly by watching what's happening on your instruments and making adjustments as deemed appropriate.
There is a very good reason that buffers are applied to speeds in the AIP and to stabilized critera for landing.