That right to refuse work based on your personal ideology has to cut both ways, otherwise those in power get to decide what is a 'just' reason for refusal of services and what is an 'unjust' reason. If the right group of racists were in power, then I could be legally compelled to perform services for those who are openly hostile towards me, which you yourself seem to intimate would be 'unjust'

In the same way that I can choose not to take a job at Nestle because of how they treat our freshwater supply, I can also choose not to work on Jimbobs computer because he doesn't believe the Holocaust happened.

Also 'systems' was just a placeholder to clarify I wasn't selling commodites, sorry for any confusion there.