It's not. I have no idea how you got there.
The right thing is to seek evidence for both perspectives. This is ironically not rocket science. Don't accept any viewpoint just on say-so, but especially don't pretend to sneering objectivity when you do so.
> Don't accept any viewpoint just on say-so
Exactly. That's why they asked for a citation. A response providing such citation is more appropriate than essentially saying "well you didn't ask for a citation from $other_side either".