It has an undertone implying some sort of strange conspiracy amongst rust people. Generally to be suspicious of something means there is something nefarious going on.

It has an implication that Linux is something that any enthusiastic group of outsiders could force their changes into. And that there are rust people would create such a group of outsiders.

It has an implication that rust people and linux people are disjoint sets.

It's generally taking this strange adversarial view to a collaborative endeavour. People aren't "rustaceans" or not, it's not a sports team. People are people, they generally program in a wide variety of languages, and use whatever they think is best given a certain context.

I'm not sure if I've fully captured what seems "off" to me about the comment, but hopefully you get the gist.

As for asking questions, that's a clear example of https://rationalwiki.org/wiki/Just_asking_questions - but at the same time the general sentiment seems to be frequently reflected in internet comments. I don't think it's a malicious case of this, just how they chose to express their opinions.