My view of the matter; "Flag" him if you want and let the debates be over. Let's start using the now once again reformed downvote as an actual downvote, take away the flag icon and adjust the power it has.
Real flags can be introduced once the entire community and platform has matured, so that we actually know how it would best be used and limited.
While I'd be hesitant to use the likely percieved by many as agressive language you just used, simply because of how it typically have ended up making the conversation into the tiring defensive/offensive back and forth rant that we've seen for so long already, I tend to agree with your overall position.
Thank you for publicly backing the position quoted.