Rspec run all tests except a specific folder

Take a look at Exclusion filters in Rspec Project, might help.

You also can run only tests that you want with Inclusion filters.

Use an --exclude-pattern, they're quite convenient:

https://www.relishapp.com/rspec/rspec-core/v/3-3/docs/configuration/exclude-pattern

One of the nice things about them:

The --exclude-pattern flag accepts shell style glob unions

So you could do something like rspec --exclude-pattern "spec/{foldername1,foldername2}/**/*_spec.rb"