This is a classic ad hominem argument.
There was a claim made, someone asked for evidence, and then a third person provided the evidence. Done. This is a good way for discussions to work. What would really kill the discussion is if people stopped and gathered evidence first, and compiled it into every comment they made. I trust people are skeptical enough not to believe garbage, and if they’re curious they can ask questions or do additional research themselves.
But it would be pretty quiet on here if people only talked about what they actually know.