The best/funniest way they could respond to the backlash is to just replace crisp rat’s voice lines entirely with Charles Martinet making his standard Mario gibberish noises and change nothing else.
Just play it completely straight, leave all the other dialogue exactly as-is
Peach: And so, brave heroes from beyond, I implore you to save our kingdom. You are the only ones who can.
Luigi: What? No… no, that’s crazy, we’re not heroes, we’re plumbers! Tell her, Mario!
Luigi: You.. You don’t really mean that, do you? You can’t, not after everything that’s happened!
Mario: WAHOO MAMMA MIA
*Mario straightens his hat and grits his teeth as the camera zooms in on his face*
I promise as soon as the Mario movie comes out in a format where I can load the video into my editor, I will re-edit it so all of Chris Pratt’s lines are replaced with Mario 64 noises.