Imagine you run a commercial photography studio. The following scenario arises:
A potential client calls; it's the 'Holy Church of God is More Colourful than a Baboon's Arse' (not a real church, just in case you were wondering). This church wants some promotional shots of the congregation. You end the call saying you will provide a quote (as normal), and then quickly google the church to get a sense of their needs. My search turns up that this church is strongly homophobic. Wetboro Baptist Church level homophobic (you can swap that out with anything comparable that you find abhorrent if gay rights ain't your thing)
In 2000, Scott Brockie, a Toronto printer, was fined $5,000 by the Ontario Human Rights Commission for refusing to print letterhead, envelopes, and business cards for the Canadian Lesbian and Gay Archives. Brockie unsuccessfully appealed to the Ontario appellate court to overturn the fine. The court ruled that the order requiring Brockie to print the materials was a justifiable violation of Brockie's religious rights, though it limited the scope of the Commission's ruling to only ordinary material such as letterhead and envelopes, saying the Commission "ought not to require Mr. Brockie to print material of a nature that could reasonably be considered to be in direct conflict with the core elements of his religious beliefs."