Coding standards are helpful and not uncommon when collaborating within a team.
As much as you don't like using 4 spaces, it's much worse to have a codebase littered with some sections using 4 spaces, some sections using tabs, some sections using 2 spaces, some sections using 8 spaces, and some sections using a random assortment of nothing in particular.
Just as you accept the apparent standard of 2 spaces when working within the Ruby community, for consistency's sake I'd hope you would accept the standard of whatever other team you're working with.
As much as you don't like using 4 spaces, it's much worse to have a codebase littered with some sections using 4 spaces, some sections using tabs, some sections using 2 spaces, some sections using 8 spaces, and some sections using a random assortment of nothing in particular.
Just as you accept the apparent standard of 2 spaces when working within the Ruby community, for consistency's sake I'd hope you would accept the standard of whatever other team you're working with.