[quote="sproutandbean"] Though I said nothing and neither did they.
The biggest cause of disputes is people jumping to conclusions about each other, based on incomplete information. Ask yourself the following:
1. Do you know that they definitely put Worcester sauce in your drink? Is it possible that you were mistaken or that it was something else?
2. Do you know that they know that Worcester sauce isn't vegan? (I recently explained to a vegan of 10 years from Worcestershire that it contains fish and he was shocked because he'd never heard this and had been eating the stuff all his life).
3. If the answer to both the above is definitely "yes", do you know why they did it? If you are making assumptions about why they did it, you could be tying yourself in knots for no reason.The only way to find out whether and why they did it is to ask them. So ask them.
If you establish that it was definitely bullying, you could point this out to them and explain that you won't tolerate this kind of behaviour again. Under the Equalities Act, they are on very dodgy ground.