As someone with severe food allergies that I've lived with my entire life, I understand this point of view. Some people will discriminate because of a dietary choice he made, but if you imagine someone in that situation to whom it was not a choice it would become a human rights issue rather than a laughing matter.
If I was being paid to do a job in a remote location, and I had specified my dietary restrictions that were promised to be accommodated... I would have starved relying on Tim Hortons for sustenance.
And to clarify, my food restrictions are entirely different than the ones mentioned in the article. But if I saw my food being contaminated, it wouldn't be a personal issue of "this chef doesn't care", it would be more along the lines of "I guess I'm skipping dinner tonight because I don't want to make a scene".
Allergy rant over,