I'm non-binary myself and it's not like I am bursting with joy that Morph is designated NB like it's amazing how Disney is representing me... I think it's great but it's such a miniscule thing. They could have said Morph is lactose intolerant and I would have the same reaction. It really doesn't matter. I felt the same when Bobby Drake came out in the comics. It doesn't change the character at all in my eyes. So I don't see it as revolutionary or groundbreaking just a cool little thing and I don't expect it to be explored in depth at all.
However the vitriol against it is just insane and it speaks a lot to how trans and NB folk feel about coming out. When I came out, there were the select people who were overjoyed by my journey of self discovery and were excited about my transition and then there were the people who got kind of serious and dour about it, the people who just said "word" and immediately started worrying about pronouns or misgendering me, basically internalizing it instead of just being happy for me. Because it shouldn't be such a big deal to OTHER PEOPLE that I'm NB - it's a big deal for ME. It's MY thing. I don't care if people slip up with pronouns I care more that I'm not perceived differently because I've found definition for my identity.
There isn't a "gay" way of doing things and there isn't a "non binary" way of doing things, it's an internal discovery. When other people who are not the person coming out make such a big deal out of it, it comes off to me like a deeply rooted insecurity. Of course there is the right-wing pure distaste and hatred but across the board it feels like insecurity and also a lack of education.
It's really just as simple as accepting it and moving on. What's the absolute worst that can happen? I'm no fan of Disney's virtue signaling but that's not what this is at all. It's just a thing.
Just speaking based on my experience, I'm sure other people might feel differently about the significance, but to me the most problematic one can do in this situation is keep making mountains out of molehills. Just imagine being a closeted trans person like I was in a room full of cis people talking endlessly about trans and queer stuff in this hyperfocused way. It sucks. Just move on.