How to disable SASS in Omega 4?
But how what I can't find is, how do they stop the production server from trying to run SASS and access all that Ruby stuff all the time?


There seems to be a major misunderstanding here. 

Compilation of SASS is invoked by you, it's not an automatic action that a server will just take upon itself to perform. Your remote VPS will not be set up to try to auto-compile SASS into CSS unless you, or someone else with access to the server, has set it up like that. The very fact that you've had to setup and install ruby on the remote serve should hopefully make that obvious.

Having that stuff on your production server is wrong anyway, you should prepare your distribution locally (read: compile SASS, minify/uglify js, etc), and sync that. That way you can never have any problems.

Your comment below the question is correct: if you don't want to compile SASS, then simply don't run bundle exec guard, compass compile, or whatever other method you're using to instigate the compilation. 

If you haven't told any process to watch/compile your SASS files, then no process will be able to do so. The power is yours.