Workplace Bullying Hi Andrew
There is a difference between direct discrimination which is illegal against anyone, and indirect discrimination which is not illegal but sits in the grey area of dubious behaviours. I learned this during an hour-long phone call with an advisor from HRC, a few years ago. I won't go into further detail because it's really up to you whether you're sufficiently interested to learn as well.
Leaving that to one side, I send a heartfelt prayer to the universe that all vegans and other unpopular minorities (probably not vegan muslims, but that's another obvious learning opportunity for you) find out where your workplace is and give it a wide berth.
Finally, you may wish to reply to this final posting from me but I will just delete your email if it appears in my inbox. Don't let that stop you though, knock yourself out