He fails then ghosts.
A few examples proper responses:
"I will research this matter and attribute sources if and when possible"
"I realize my mistake and I will correct it by taking down this post"
"I will research the scientific facts and determine the credibility of this post"
The difficult thing with learning, knowledge, and science is not so much knowing and understanding everything and being right all the time. The problem is knowing enough and understanding enough to know when you are wrong. And then educating yourself on the scientific facts.
Autoprax, how am I doing here?