Is flat frequency response a hoax?

I have seen a number of speaker companies claiming that their design has a ruler flat response. They then proudly display a graph with a flat line as if it's an indication of its superior quality. Poppycock.

Flat response is a myth. Everybody has different hearing so there's no reason to expect that there would be a one size fits all frequency response.
We don't all wear the same sized shoes do we? Everybody has different sized feet. 

There are plenty of flat response speakers that sound horrible. I've heard quite a lot. There are many non ruler flat great sounding speakers too.
Do not be duped by this hogwash. 

If the mixing engineer used a pair of speakers that is 3db down in the mids and top end then he may have boosted that region by a similar amount. Now when the track gets played on a ruler flat speaker it sounds too bright. So as you can see, a flat response is useless.

Congratulations to Kenjit for resurrecting a theme I thought died in the 1980’s.
Kenjit, I am wondering if  you have a social or neurological atypicality that, if we knew about it, would help us better relate to what you are saying?

This is not the first post you have written that riles people up and where no one is sure what your real intentions in posting are. 

Speaking for myself, this would be very useful to know. As things stand, I don’t know whether or not to give you the benefit of the doubt, and that would be nice to know. I am writing all this without snark or disdain. Just trying to grasp what makes you tick. Can you help? 

To be clear, I am not seeking an answer that goes back to your op or is otherwise audiophile related. 

Thanks for whatever light you can shed. 

Music is curvy, and if anybody thinks it's flat that's likely duo to their cranium being crammed into something.
Kenjit and his troll-baiting threads need to go away and let the adults have intelligent conversations.