I told him to stop, but he couldn't stop mentioning it. I got annoyed and snapped.
Evangelism is very annoying. Don't do this. If you don't like clojure, then get a new job that doesn't involve clojure, but don't come to clojure community and keep telling people to consider Rust or any other language.
If a clojure programmer disgruntled with a Rust job went to a rust community and kept telling people to maybe ditch Rust and consider clojure, would it not be annoying as hell?
I think your programming language is inferior to mine. You think my language is inferior to yours. No one is going to agree because it's a matter of opinion and taste.
Just let people use their languages according to their personal preferences. Let them write cobol, fortran, C, clojure, C++, Rust, Haskell, or whatever. Don't bother programmers with other languages.
Leave people alone. If you want to evangelize your language, publish contents. Don't bother people.
Evangelism is as annoying as an ugly guy stalking a beautiful princess. No means no. Respect personal boundaries.