Technically yes, but your response is fair use because the purpose and character of your response was literally "fair and reasonable criticism" and did not "supersede the use of the original work".
Exact same reason parody is cool.
Why technically? Simply yes, unless the website terms and conditions provides otherwise.
However his quoting of it would probably fall under fair use, even though he copied all of it.
I only said technically because the case for fair use would be so strong that in practice I doubt I could actually be sued successfully.