Generalizing with "everything", "all", etc exclusive markers is exactly the kind of black/white divide you're arguing against. What happened to your nuanced reality within a single sentence? Not everything is black and white, but some situations are.
The person he's replying to argued against putting things on a spectrum. Does that not imply painting everything in black and white? Thus his response seems perfectly sensible to me.
He argued against putting things in a spectrum in many instances where that would be wrong, including the case under the question. What's your argument against that idea? LLM'ed too much lately?
He argued against and the response presented a counterargument. Both were based around social costs and used the same wording (ie "everything").
You made a specious dismissal. Now you're making personal attacks. Perhaps it's actually you who is having difficulty reasoning properly here?