What do you think a proportionate response would be for someone who thinks her comments on the original movie are totally off base?
To state—calmly and in a manner befitting an adult—“I think her comments on the original movie are totally off base” before elaborating on why.
I haven’t seen many responses to her comments that fit your description but we might just have different frames of reference.
Here are some direct quotations from this forum:
“She's never been put in her place or had anyone teach her respect.”
“People may be political about a snotty starlet who dissed the source material at company-sponsored media events.”
“What audiences and fans will not accept is outright contempt for the original. That contempt oozes out of everything that has emerged from her.”
“Yea, what part of you don’t crap in the same exact spots you eat and sleep doesn’t this twit understand…?!?!?!”
“Before Disney sends Rachel Zegler out on the talk show circuit this winter, they need to give her media relations lessons from Halle Bailey. If not just perform a personality transplant.”
“On the other hand, ‘It’s not 1937 anymore’ is a direct attack on the original film (and the people who love it).”
“Rachel Zegler said nothing new or bold or insightful. It's all so stale and predictable now. But somehow, and this is the magic of it all, she comes across to many as being this unlikable person. A real snot.”
“Because she's a snotty young person who just crapped on previous generations of artists who were far more accomplished than she is.”
These are just some of the posts (most of them by men in their 40s or older) that, to my mind at least, represent a rather extreme reaction to what Zegler said. No film is worth getting that worked up over.
ETA: And yes, I will acknowledge that I myself was perhaps guilty of a bit of hyperbole in my earlier post. Only a small number of posters here have said things that are truly unhinged. But many have reacted in a manner that I consider disproportionate and/or unseemly.