I only found one comment by Dorn in my notes:

The deluxe aluminum-and-leather sash he wore in “Generations” gave Michael Dorn fits: "It's freakin' heavy and can wreak havoc with your body posture," Dorn recalls. "It gave me back problems." [TV Guide [June 24, 2006].

Also look for Dorn’s various comments on costumes, teeth, make-up, using the bat’leth, etc. – all of which may have affected his attitude to the character and the language over the years. 

Voragh

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From: Elizabeth Faber <elizabeth.lawrence08@gmail.com>

I don't recall direct quotes, but he was interviewed in the documentary "Earthlings: Ugly Bags of Mostly Water" and was pretty clear about his opinions.  It is likely that someone on this list has a copy.

On Mon, Apr 26, 2021 at 4:32 AM Lieven L. Litaer <levinius@gmx.de> wrote:

At the Facebook group, a side part of a discussion focussed on Michael
Dorn's attitude towards the Klingon language. It seems common knowledge
that he doesn't take it seriously, but there are no clear sources or
evidences.

I would like to write a few lines on that topic in the Klingon Language
Wiki, but would like to have reliable sources for what is said.

So – does anyone know of a quote or other source where Dorn actually
said this?