Rust users are generally friendly to one another, and to people who are interested in Rust. Hoever, some Rust users are toxic when talking to people outside the community or to people who disagree.
That's why a lot of us (in the Rust community) don't notice it; we spend most of the time inside our own community talking to each other and being friendly to each other.
This is a trait common to any bubble or insular community whether it be about politics, religion, economics, or whatever. It's fairly easy to recognize once you get in the habit of dis-identifying with your own side.
There's also a phenomenon in human psychology where we tend to forgive "our side's" misbehavior, presumably because it's in service to a higher ideal and therefore forgivable. It's the difference between "passionately spreading the good word" and "aggressive evangelism", two views of the same action. After learning about this I've even seen it in myself, though hopefully I've learned to counteract it a bit.
Note that this isn't unique to Rust, other languages have this too to an extent.
It's something I really hope we can leave behind, because it's hurting an otherwise beneficial message that Rust can bring a new tradeoff that is favorable for a lot of situations.
I'm not even sure if this is the case. I have seen enough toxic Rust users, but at least in my experience they rarely overlap with who are active in the community. This suggests that they are experiencing typical newcomer syndrome, comparable to Haskell newcomers' urge to write a monad tutorial, and also explains that why a disproportional number of non-Rust users observe toxic Rust users---if you are a Rust user but don't preach about Rust everywhere, how can others tell if you are indeed a Rust user? :-)