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.

I quit eating ice cream because none was custom built for my taste buds.
Just the ice without the cream tastes fairly flat
I quit eating ice cream because none was custom built for my taste buds.

You're using the wrong analogy. The audiophile community is quite big. There is no similarly large community of ice cream eating enthusiasts that is as fastidious about the flavor of their ice cream as audiophiles are about sound. 

You are either not a real audiophile or you are in denial. If you dont care about sound quality, what makes you an audiophile?

You may be duped into buying a speaker because its designer says its perfectly flat. This is a myth. What you need is a speaker that is tuned to your ears not a flat response. 

If you disagree, you need to state your reasons and stop being sarcastic. 

Even before it was recorded it isn’t flat. I played Carnegie Hall in NY, and Avery Fischer in NY, and my instrument sounds way different in each hall
There is a rumor going around that I am perfect.   That's a hoax too!