It's not snobbery, it might have come out the wrong way (the word serious was a bad choice), but the idea still stands. It's completely fine to use different editors, as it is fine to keep developing web applications in php and not trying things like ror/django/node.js/nextbigframework, or never learning a lisp dialect.

But in all cases, just learning them will most likely improve your skills in many ways. Maybe you won't change from textmate to vim or emacs, but you will pick up many things from them that I believe will make your life easier.