I honestly don't even know what to respond to that, but it's kind of weird to me to honestly think that you'd need essentially a "PhD" in order to use a tool...
“Skill issue” definitely does not means “mentally deficient”. It comes from the videogames world, where it is used to disparage the lack of training/natural ability of other players; frequently accompanied by “get good”, i.e. continue training & grinding to up your skill.
I struggled with Rust at first but now it feels quite natural, and is the language I use at work and for my open-source work.
I was not "mentally deficient" when I struggled with Rust (at least that I know of :v), while you could say I had a skill issue with the language
And it's not even that i dislike the language, but this is evangelism to just dismiss the point of my argument with "skill issue". A tool isn't supposed to be difficult, it should help you in whatever you're trying to achieve, not making it more difficult.