There are a few people who think they need to argue loudly and harshly to be listened to (possibly because they've learned that that works in other projects). Those are the folks who are likely to see little patience but also little argument; they'll get downvoted on Reddit and ignored on IRC. Which is good for the community, since any effort spent arguing with them can be spent working with people who are actually there to learn.
The easiest example to see might be when people show up on IRC picking a fight (whether against something Rust does, or technically in favor and deriding some other language). They'll get one reply saying "Yes, but there are always tradeoffs and other languages are great too", one reply saying they're off-topic, and no more engagement. Which is not to say you can't show up on IRC asking for a language feature! As long as you don't say that anyone who leaves the feature out is stupid -- and again, most people don't say that -- you'll get a helpful response.
The IRC channel is among the most helpful of any programming language I've seen so far, users.rust-lang.org gets multiple helpful responses to practically any question and the subreddit is very helpful for keeping up with the latest projects and take in community input.
I also observed that the Rust core team and community are very aware of its current shortcomings and are working on them with the community via the RFC process.
It's also very easy to contribute, you don't have to sign any CLA etc., and a member of the core team will even mentor you if you wish.
It would be helpful if you offered some concrete examples instead of being this generic.