I think the person you replied to never said "only people who do not understand Rust dislike it," or anything similar to that.
Even pretending that they did, I don't know if "appreciat[ing]" Rust means that you're saying that you "understand" it. It seems like choosing a different word in the second sentence of a two sentence argument may be an subtle way of hinting that you don't know Rust, although you've read articles about Rust and made judgements about it. If this is true, then it doesn't strongly support the first statement.
I'm seeking to draw a distinction between disliking rust for the real (or perceived) difficulty of learning/using it, and disliking it on principle, because you don't like it's trade-offs, approach to achieving it aims, syntax, type system, etc. This dichotomy is meaningful irrespective of the level of experience one has with Rust, beyond a certain level (and for the record I believe I have the requisite level of knowledge of rust to have an informed opinion on it).
For example, I don't know much Haskell. It seems to me (and to many other I read online) like it would be difficult to learn (and maybe use), although I'm familiar with functional languages in general. However, based on the little I've learned about it so far, it is a language I'd absolutely love to dig much deeper into as time permits, because almost everything about it makes so much sense to me.
Here's something amazing, I started to design my ideal language, before I started learning Haskell, and almost every language construct in Haskell I learn about seems to match exactly how I'd designed my language by coincidence (even down to keywords like "where", "do" blocks, etc.)
Even pretending that they did, I don't know if "appreciat[ing]" Rust means that you're saying that you "understand" it. It seems like choosing a different word in the second sentence of a two sentence argument may be an subtle way of hinting that you don't know Rust, although you've read articles about Rust and made judgements about it. If this is true, then it doesn't strongly support the first statement.